PowerSpec G758 – Screen Goes Black During Gaming (GPU Loses Signal, PC Stays On)

laithm · November 29

System: PowerSpec G758 (stock configuration)

Issue: Screen goes dark while gaming, but the PC continues running (fans stay on, no restart).

Detailed Description of the Problem

When playing games, my monitor suddenly loses signal — the screen goes completely black — but the PC itself stays powered on. I can still hear the fans, and the system does not crash or reboot. I have to force-restart to recover display output.

The blackout happens only under gaming or GPU load. The system works normally on the desktop or during light tasks.

Important Detail

I accidentally pressed the BIOS / Flash BIOS button on the back of the PC. I’m not sure if that affected my BIOS settings or caused a partial reset. The issue started happening around that time.

What I Have Verified So Far

PC does not shut off — only the display signal is lost
Happens in games only
No overclocking
GPU fans spin normally
No error messages on reboot
Happens with DisplayPort
Temperatures (when checked before blackout) appear normal
No USB flash drive inserted during accidental BIOS button press

I purchased this PC on November 19th, was wondering if this a software bug or if I need to return it during my return window.

Thank you

laithm · November 29

1. Reset BIOS to default
I entered BIOS and restored optimized defaults. No overclocking of any kind.

2. Clean driver reinstall using DDU in Safe Mode

Used DDU to remove NVIDIA drivers
Installed the latest driver
Also rolled back to NVIDIA 577 to test an older stable driver
→ Issue persists on all drivers

3. Stress testing the GPU with FurMark
FurMark runs but the system blacks out at 92% load every single time.
The PC stays on — only the GPU output dies.

This only happens under heavy GPU load. Desktop/light tasks are fine.

4. Accidentally pressed BIOS/Flash button on the back of the PC
I pressed the BIOS button on the rear I/O by mistake before this started happening. I’m not sure if that affected GPU initialization settings or stability, but BIOS has already been reset since then.

laithm · November 30

After performing several tests and the issue progressively gotten worse, it turned out on my 10 day old computer, the power supply failed. This was very disappointing that I live 6 hour round trip from the closet microcenter. I ultimately purchased a new power supply and installed it. All test have passed since, and the issue was resolved.

PowerSpec G758 – Screen Goes Black During Gaming (GPU Loses Signal, PC Stays On)

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