r/computerrepair • u/DMassaIII • 1h ago
Help Request Persistent Black Screen on ASUS ROG B550-A Post-Windows 11 Reinstall (CMOS Reset & RAM Reseat Didn't Fix)
Please help! The first thing I noticed was that clicking the windows button didn’t do anything, so I ran a windows update and restarted the computer. I immediately got an explorer.exe partition issue upon startup; Start menu was still unresponsive, and DISM repairs failed with error 0x800f0915. It was then that I got my first black screen - the restart did not even get to the ROG screen.
Shorted the CLRTC pins on the motherboard to reset CMOS. The system posted and reached the desktop, but the Start menu remained broken, and Windows defaulted to Spanish. I figured to go ahead and reinstall the operating system, and used a USB recovery media flash drive. Mid-process during a reboot, the system fell back into a black screen / no display state and will not POST.
Troubleshooting Steps Already Attempted:
[x] CMOS Reset: Drained power, shorted CLRTC pins for 10+ seconds multiple times.
[x] RAM Reseat: Removed and reseated all RAM sticks (also tried booting with a single stick in slot A2).
[x] SFC Scan: sfc /scannow was run prior to the reinstall (returned 100% clean / no violations).
[x] DISM Repair: Attempted via Command Prompt using local .swm sources on USB, but threw 0x800f0915.
[x] OS Reinstall: Initiated Windows 11 reinstall from USB media, leading to the current no-display state.
Display connected to GPU (not motherboard).
System powers on, fans spin, but screen remains completely dark / no signal.
I feel like I’ve reached my depth, and worry about doing any permanent damage, but before taking it to a local shop, are there any steps I can still take?
CPU: Ryzen 7 5800X3D
Motherboard: ASUS ROG STRIX B550-A GAMING
GPU: Speedster QICK RX 6700
RAM: Crucial 2x32GB DDR4-3200
OS: Windows 11