Why does my laptop keep rebooting on startup and how to fix it

You turn on the laptop, see the manufacturer's logo - and instead of booting the system, an endless loop of restarts begins. Sometimes the process gets to the Windows login screen, but after a few seconds everything repeats. This problem can occur on devices of any brand: from budget Lenovo IdeaPad up to bonus Dell XPS or gaming ASUS ROG. The reasons range from a banal update failure to critical processor overheating or motherboard malfunction.

In this article we will look at all possible reasons for a cyclic reboot, starting with software (which you can fix yourself) and ending with hardware (requiring the intervention of a service center). You will learn how to diagnose a problem based on symptoms, what actions to take first, and when to contact a specialist. We will pay special attention hidden BIOS/UEFI settings that can block the system from booting after Windows 10/11 updates.

1. Diagnosis of the problem: how to determine the cause from the symptoms

Before starting repairs, it is important to understand at what stage the failure occurs. This will help narrow down the possible causes:

• 🔄 Reboot on the manufacturer's logo (before the Windows loading indicator appears) - most often indicates problems with BIOS/UEFI, HDD/SSD failure or hardware conflict.
• 🖥️ Rebooting at the Windows boot screen (twirling dots or logo) - typical for update failures, damage to system files or drivers.
• 🔥 Shutdown/reboot 2-5 seconds after switching on - a sign of overheating, a faulty power supply or a short circuit on the motherboard.
• 💾 Error message (BSOD or text on black screen) — allows you to more accurately identify the problem by code (for example, CRITICAL_PROCESS_DIED or INACCESSIBLE_BOOT_DEVICE).

If the laptop does not have time to issue any messages, try record a video of the process on your phone - this will help you notice any flashing errors. Also pay attention to the sound signals (beeps) when starting: their interpretation depends on the model BIOS (for example, at AMI BIOS 1 long and 3 short beeps indicate a video card malfunction).

2. Software reasons: Windows crashes, drivers and updates

In 60% of cases, cyclic reboots are associated with software errors. Let's look at the most common scenarios and how to resolve them.

2.1. Damage to system files or registry

If the laptop restarts after a recent Windows update or driver installation, most likely, critical system files are damaged. In this case it will help boot in safe mode:

1. When turning on the laptop, hold down the key F8 (for Windows 7) or Shift + F8 (for Windows 10/11). On some models (HP, Acer) may be required Esc → F9.
2. From the menu, select Safe Mode with Command Line Support.
3. Enter the command to check the integrity of system files:

   sfc /scannow

4. Once the scan is complete, reboot as normal.

If Safe Mode is not available, use Bootable USB flash drive with Windows:

• 📁 Boot from the flash drive, select System Restore → Command line.
• Run the commands in order:

  bootrec /fixmbr
  bootrec /fixboot
  bootrec /scanos
  bootrec /rebuildbcd

2.2. Driver conflict after update

A common reason for reboots is incompatible drivers, especially for video cards (NVIDIA, AMD) or chipsets (Intel, AMD Ryzen). If the problem started after updating the drivers:

1. Boot into Safe Mode with Networking.
2. Open Device Manager (Win + X → Device Manager).
3. Look for the device with a yellow exclamation mark (usually a video card or network adapter).
4. Right click → Properties → Roll back driver.
5. If a rollback is not available, uninstall the driver completely and reboot - Windows will install the base version.

For laptops with hybrid graphics (NVIDIA Optimus) may be required complete removal of drivers utility Display Driver Uninstaller (DDU) in safe mode. You can download it from the official website Wagnardsoft.

3. Hardware reasons: from overheating to motherboard malfunction

If software methods do not help, the problem lies in the hardware. Let's look at the most likely hardware faults and methods for diagnosing them.

3.1. Overheating of the processor or chipset

The laptop may restart due to critical overheating, if:

• 🌡️ The cooling system is clogged (dust in the radiator or dried thermal paste).
• 🔄 The cooler does not work (bearing wear or power failure).
• 🔥 The processor is overclocked above standard frequencies (especially important for gaming laptops MSI or ASUS TUF).

To check the temperature:

1. If the laptop turns on even briefly, use HWMonitor or Core Temp (run from a flash drive in portable mode).
2. Temperature higher 90°C in idle time or 100°C under load - a critical indicator.
3. If the laptop turns off after 1-2 seconds, it is most likely triggered hardware overheat protection (thermal shutdown).

Solutions:

• 🛠️ Cleaning from dust: disassemble the laptop, blow out the radiator with compressed air, replace the thermal paste (we recommend Arctic MX-6 or Noctua NT-H2).
• 🔧 Cooler replacement: If the fan does not rotate or makes a grinding noise.
• ⚙️ Resetting BIOS Settings: If overheating is caused by overclocking, reset the settings to default (Load Optimized Defaults).

How to check the cooler without disassembling the laptop

Place your hand near the ventilation grilles when turning on. If the air flow is weak or absent, the cooler does not work. Also listen: a working fan makes a uniform noise, not a creaking or crackling sound.

3.2. Faulty RAM or slots

Problems with RAM often manifest themselves as cyclical reboots, especially if:

• 🔄 The laptop reboots at regular intervals (for example, every 3-5 minutes).
• 💥 Artifacts appear on the screen or blue screens with errors like MEMORY_MANAGEMENT.
• 🔌 The laptop does not turn on after adding a new memory stick.

Diagnostics:

1. Turn off your laptop, unplug the charger, and remove the battery.
2. Open the back cover and remove all the strips RAM (on some models Apple MacBook or HP Spectre the memory is soldered - then this method is not suitable).
3. Try running a laptop with one bracket, changing slots. If the problem persists with one of the strips, it is faulty.
4. For deep checking use MemTest86 (bootable image for flash drive).

If one of the strips is broken, it must be replaced. If a slot on the motherboard is damaged, the board will need to be soldered or replaced.

3.3. Problems with your hard drive or SSD

If the laptop restarts at the Windows boot stage, but at the same time enters BIOS, the following drive malfunctions are possible:

• 💽 Bad sectors on HDD (characteristic clicking sound).
• 🚨 Controller Blade on SSD (the drive is not detected in the BIOS or is detected with the wrong capacity).
• 🔌 Poor contact connector SATA/M.2 (the problem is resolved by reconnecting).

Diagnostics:

1. Boot from flash drive Victoria HDD or CrystalDiskInfo (portable version).
2. Check the parameter Reallocated Sectors Count (for HDD) or Percentage Used (for SSD).
3. If the drive is not detected, try connecting it to another device via USB adapter.

Solutions:

• 🔧 If the disk is detected, but has bad sectors, clone the data to a new drive using Macrium Reflect or Clonezilla.
• 🆕 When the controller fails SSD Data recovery is possible only in the laboratory (cost from 5,000 ₽).
• 🔌 If the problem is in the contact, reconnect the disk or replace the cable (relevant for M.2 SSD in laptops Lenovo Yoga or HP Pavilion).

4. Problems with BIOS/UEFI: resets, updates and hidden settings

Modern laptops often reboot in a loop due to incorrect BIOS settings or failures when updating it. Let's consider typical scenarios:

4.1. Reset BIOS to factory settings

If the laptop starts to reboot after changing the settings BIOS/UEFI (for example, inclusions Secure Boot or changing the boot priority), perform a reset:

1. Sign in BIOS (usually keys F2, Del, Esc or F12 when turned on).
2. Find the option Load Default Settings or Load Optimized Defaults (different BIOS versions may have different names).
3. Save changes (F10) and reboot.

If the laptop does not enter the BIOS:

• 🔋 Turn off the charging and remove the battery (if it is removable).
• 🕒Hold the power button 30-60 seconds for discharging capacitors.
• 🔄 Connect the charger and try to turn on the laptop.

4.2. Updating BIOS from a USB flash drive

If a cyclic reboot has started after a failed BIOS update, will be required firmware recovery. To do this:

1. Download the latest BIOS version for your model from the manufacturer's official website (for example, Lenovo or ASUS).
2. Unpack the file and rename it to BIOS.bin (or according to the instructions for your model).
3. Format the flash drive to FAT32 and copy the file to it.
4. Connect the flash drive to the laptop, hold Win + B (for Lenovo), Ctrl + Home (for ASUS) or another combination (check for your model) and turn on the power.
5. Wait for the process to complete (the laptop may reboot several times).

⚠️ Attention: An incorrect BIOS update can permanently damage your laptop. If you are not sure of your actions, contact the service center. For laptops Apple MacBook BIOS recovery is only possible using a special programmer (CH341A).

4.3. Conflict with Secure Boot and Fast Boot

On laptops with UEFI (most models after 2012) cyclic reboot may be due to:

• 🔒 Secure Boot — blocks loading of uncertified OS (for example, after installing Linux or modified Windows).
• ⚡ Fast Boot - accelerated loading, which sometimes conflicts with drivers.

Solution:

1. Sign in BIOS and turn off Secure Boot (section Security or Boot).
2. Disable Fast Boot (may be called Quick Boot or Fast Startup).
3. Save the settings and reboot.

Manufacturer	BIOS entry key	BIOS reset option	Features
Lenovo	F2 or Fn + F2	Load Default Settings	Some models have a hidden menu (Fn + R when the laptop is turned off).
HP	Esc → F10	F9 (Load Defaults)	To reset the BIOS password, you will need a code generator.
Dell	F12 → BIOS Setup	Restore Settings	Supports BIOS recovery from a flash drive (Ctrl + Esc).
ASUS	Del or F2	Load Optimized Defaults	Has a function EZ Flash to update the BIOS.
Acer	F2 or Del	F9 (Setup Defaults)	On some models, the BIOS is locked with a password (acer or admin).

5. Problems with the power supply and battery

If the laptop restarts only when running on battery or when connecting charging, the problem may be:

• 🔌 Faulty power supply (does not produce enough voltage).
• 🔋 Swollen battery (may put pressure on the motherboard, causing a short circuit).
• 🔌 Damaged power connector (a common problem in ASUS And HP after 3-5 years of operation).

Diagnostics:

1. Try starting your laptop without battery, only from charging. If it works stably, the problem is in the battery.
2. Check the power supply with a multimeter: the voltage should correspond to that indicated on the sticker (for example, 19.5V for most laptops).
3. Inspect the power connector on the laptop: if it wobbles or sparks, soldering is required.

Solutions:

• 🔧 If the power supply is faulty, replace it (original or compatible with the same power).
• 🔋 Swollen battery is necessary urgently replace - it can damage the motherboard.
• 🔌 If the power connector is damaged, contact service - independent soldering is fraught with a short circuit.

⚠️ Attention: If the laptop restarts when the charger is connected, disconnect it immediately! This may indicate a short circuit in the power circuit, which can lead to a fire. Do not use the device until the problem is resolved.

6. Viruses and malware as a cause of reboots

Rarely, there are viruses that provoke a system reboot to disguise your activity. For example:

• 🕵️ Rootkits (injected into the system kernel and can cause bootloader crashes).
• 💣 Miners (overload the processor, overheating and shutdown).
• 🔄 Bootkits (modify the boot sector, which leads to cyclic reboots).

Diagnosis and treatment:

1. Boot from LiveCD (For example, Kaspersky Rescue Disk or Dr.Web LiveUSB).
2. Scan your system disk for viruses (pay attention to folders Windows\System32 And Boot).
3. If viruses are found but are not removed, format the disk and reinstall Windows.

For prevention:

• 🛡️ Install a reliable antivirus (Kaspersky Internet Security, Bitdefender).
• 🔒 Disable autorun from external devices in BIOS.
• 🔄 Update Windows and drivers regularly.

7. When to contact the service center

If none of the above methods help, the problem is most likely hardware and requires professional repair. Contact the service if:

• 🔧Laptop doesn't turn on at all (there is no response to the power button, the indicators do not light up).
• 🔥 There are signs short circuit (burning smell, sparks, heating of the case in unusual places).
• 💻 Diagnostics showed a malfunction motherboard, chipset or video cards.
• 🔄 The laptop restarts even in BIOS or when downloading from LiveUSB.
• 💾 The data on the drive is critical and requires professional recovery.

The cost of repair depends on the malfunction:

Fault type	Approximate cost (₽)	Repair period
Replacing thermal paste and cleaning dust	1 500 — 3 000	1 day
Cooler replacement	2 000 — 5 000	1-2 days
Restoring BIOS with a programmer	3 000 — 8 000	2-3 days
Replacing the south/north bridge	10 000 — 25 000	5-7 days
Recovering data from a damaged SSD	5 000 — 30 000	3-10 days

When choosing a service center, pay attention to:

• 📝 Work guarantee (minimum 3 months).
• 🔧 Availability of original spare parts (especially for laptops Apple or Dell).
• 💬 Customer Reviews (check at Yandex.Maps or 2GIS).

FAQ: Frequently asked questions about cyclic rebooting of a laptop

The laptop reboots after replacing the RAM. What to do?

Possible reasons:

• 🔄 Incompatibility of strips (check supported frequencies and volumes on the manufacturer’s website).
• 🔌 Poor contact (remove and reinsert the bars, make sure they fit tightly in the slots).
• 💥 New memory malfunction (test the sticks separately in another device).

Also try resetting the BIOS to factory settings - sometimes new modules require manual adjustment of timings.

The laptop restarts when connected to the Internet. What's the matter?

This may be due to:

• 🔄 Network card driver (roll back or update it in safe mode).
• 🛡️ Antivirus (temporarily disable protection and check if the problem persists).
• 🕵️ Virus, which is activated when connected to the network (scan the system with LiveUSB).
• 🔧 Power settings (in Control Panel → Power Options disable USB port disabling to save power).

Is it possible to recover data from a laptop that keeps rebooting?

Yes, there are several ways:

1. Connect the drive to another computer via USB adapter (for SATA or M.2).
2. Boot from LiveUSB (For example, Ubuntu or Hiren’s BootCD) and copy the files to an external drive.
3. If the disk is not detected, use recovery programs (R-Studio, TestDisk).
4. In critical cases (for example, controller blade SSD) contact a data recovery laboratory.

⚠️ Do not try to restore data to a disk from which it was lost - this may overwrite it!

The laptop reboots after installing Windows. What's wrong?

Probable reasons:

• 💽 Damaged Windows image (download the official ISO from the Microsoft website).
• 🔧 UEFI incompatibility (install Windows in UEFI, not Leg