Won't boot
Black screen, no POST, stuck on logo
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Showing 41 of 41 researched guides in this category.
PC completely dead (no lights, no fan spin)
The system receives zero electrical power when pressing the power switch, leaving all LEDs dark and fans motionless.
Fans spin for a second then immediately shut off
The power supply initiates boot but triggers internal short-circuit protection (SCP/OCP) almost instantly to prevent component damage.
Motherboard powers on but hangs on CPU debug LED
Motherboard LEDs and fans operate, but the Power-On Self-Test fails at processor initialization, leaving a solid red or white CPU diagnostic LED.
Motherboard hangs on DRAM debug LED (no display)
System fails POST during initial memory training, indicated by a yellow or amber DRAM indicator LED and no screen output.
VGA debug LED lit or 1 long, 3 short beeps
The system passes CPU and memory checks but cannot initialize video output or detect a display adapter.
System boots to BIOS or hangs on BOOT debug LED
Core hardware initializes successfully, but the motherboard firmware cannot locate an active operating system boot loader.
PC freezes on motherboard splash screen (spinning dots freeze)
The system completes POST and displays the manufacturer logo, but halts indefinitely during early hardware enumeration.
Display goes black after Windows loading dots
System finishes UEFI/BIOS handover and starts loading Windows, but cuts video signal the moment the display driver initializes.
BSOD with INACCESSIBLE_BOOT_DEVICE at startup
Windows kernel loses access to the system partition during early startup due to changed storage controller modes or missing AHCI/NVMe drivers.
BOOTMGR is missing (Press Ctrl+Alt+Del to restart)
Legacy BIOS system cannot find the Windows Boot Manager file in the active partition volume boot record.
Stuck in 'Preparing Automatic Repair' loop
Windows repeatedly crashes during boot, triggering diagnostic repair which fails and restarts the loop.
PC power cycles infinitely every few seconds
System powers on, spins fans for 3 to 10 seconds, shuts down, and automatically turns back on in an endless loop before video output.
CMOS Checksum Error (resets settings on every boot)
Motherboard non-volatile memory loses stored configuration and date/time whenever AC wall power is removed.
Stuck on BitLocker recovery key entry screen
Windows stops boot and requests the 48-digit BitLocker recovery key because hardware integrity or TPM state changed.
Black screen and no POST following a BIOS update
A failed, interrupted, or corrupt BIOS firmware flash leaves the motherboard unable to execute Power-On Self-Test.
Front panel power button broken or disconnected
The chassis momentary power switch is broken, internally shorted, or disconnected from the motherboard front panel pin block.
CMOS battery dead (BIOS clock and settings reset on every boot)
The CR2032 motherboard coin cell battery is depleted, causing the BIOS to lose time, date, and custom memory XMP/EXPO settings whenever mains AC power is switched off.
Secure Boot Violation: Invalid signature detected
The UEFI firmware blocks the operating system bootloader because its digital signature has expired, been revoked in the Secure Boot DBX database, or belongs to an unauthenticated secondary OS.
NVMe boot drive missing from BIOS priority list after sudden power cut
An abrupt power outage or hard reset causes the NVMe SSD controller to enter a lockup or low-power recovery state, making the drive temporarily vanish from the motherboard UEFI boot menu.
Power supply surge lockout (clicks once and requires AC unplug to reset)
The power supply internal supervisor IC triggers Over-Current Protection (OCP) or Short-Circuit Protection (SCP) due to an electrical surge or transient spike, latching into a protective shutdown.
Corrupted BIOS black screen recovery via USB Flashback
A failed BIOS update, interrupted flashing process, or incompatible firmware version has corrupted the motherboard SPI flash memory, leaving the computer unable to execute initial boot code.
TPM configuration change prompt loop at startup
The motherboard firmware detects a new CPU or clear CMOS state, triggering a mandatory security confirmation screen to reset the Trusted Platform Module (fTPM / dTPM).
Uneven CPU cooler mounting pressure causing memory channel loss
Overtightening or unevenly torquing CPU cooler screws bends the LGA socket substrate, causing pin contact loss on delicate DDR5/DDR4 memory controller traces and preventing POST.
DisplayPort monitor deep sleep no signal on boot
Modern high-refresh gaming monitors fail to wake from DisplayPort deep sleep power states during PC boot, causing the graphics card to report a VGA error LED due to absent EDID handshake.
PC randomly restarts or shuts down during heavy gaming with NO blue screen
Computer instantly goes black and powers off or restarts under heavy graphics load without creating a BSOD minidump.
BitLocker blue screen asking for 48-digit recovery key on startup
Computer boots directly to blue BitLocker Recovery screen asking for 48-digit numerical key after BIOS update or hardware change.
Black screen with no display signal after enabling Secure Boot in BIOS
Motherboard fails to output display signal or POST after toggling Secure Boot for Valorant / Windows 11.
New NVMe M.2 SSD or SATA hard drive not showing up in File Explorer
Installed a new solid-state drive or hard drive but it does not appear in 'This PC' or File Explorer.
Laptop burning hot and battery drains while closed inside backpack (Modern Standby)
Laptop wakes up inside laptop sleeve or backpack, fans scream at 100%, and battery is completely drained.
Breadboarding a PC: Testing core components outside the case on cardboard
Isolate persistent short circuits, motherboard stand-off shorts, and non-POST issues by assembling bare minimum components outside case.
ASUS Q-LED and Q-Code Motherboard Debug Diagnostic Guide
Diagnose ASUS motherboard POST failures using 4-color Q-LED status lights (CPU, DRAM, VGA, BOOT) and 2-digit alphanumeric Q-Code hexadecimal readouts.
MSI EZ Debug LED Motherboard Diagnostic and POST Triage
Troubleshoot boot hangs and hardware initialization failures indicated by MSI EZ Debug LEDs (CPU, DRAM, VGA, BOOT) and 2-digit Debug Code LEDs.
Gigabyte Motherboard Status Code Display and Debug LED Triage
Diagnose Gigabyte AORUS motherboard boot failures using onboard 2-digit 7-segment status codes and 4-phase diagnostic LEDs.
ASRock Dr. Debug Hexadecimal POST Code Triage
Decode ASRock Dr. Debug 2-digit hexadecimal POST codes to isolate CPU, memory, chipset, and GPU hardware initialization failures.
Motherboard POST Beep Codes Diagnostic Guide (AMI, Award, Phoenix)
Interpret standard motherboard speaker acoustic beep codes across American Megatrends (AMI) and Award BIOS architectures to identify hardware faults.
Dell and HP Power Button Diagnostic Blink Code Triage
Decode OEM prebuilt desktop and laptop power button amber and white flashing LED patterns to troubleshoot hardware startup failures.
ATX 24-Pin Power Sequence and PS_ON Green Wire Triage
Test ATX power supply startup sequences using the paperclip green wire PS_ON jump test and verify primary +12V, +5V, and +3.3V DC rail delivery.
PSU Power Good PWR_OK Signal Delay and 5VSB Standby Rail Timing
Diagnose power supply startup handshake failures where +5VSB standby power is present but the PWR_OK (Power Good) signal fails to assert within 100-500ms.
Intel VMD and RST Storage Controller Missing Driver Windows Setup Fix
Resolve missing NVMe drives during Windows 10/11 installation on Intel 11th through 14th Gen systems caused by Intel Volume Management Device (VMD).
UEFI GPT vs Legacy CSM MBR Partition Table Boot Mode Mismatch
Fix boot failure where BIOS cannot detect a bootable drive due to mismatch between UEFI pure mode (requiring GPT) and Legacy CSM mode (requiring MBR).
EFI System Partition Corrupted BCD Rebuild Procedure
Repair corrupted or missing Boot Configuration Data (BCD) on the UEFI EFI System Partition using Diskpart and the bcdboot command in Windows Recovery.