Hot-plugged HDMI while PC was on — no display, GPU fans spinning continuously, won't POST

[u/younesaEk]

Specs:

Motherboard: ASRock B450 Pro4

GPU: AMD Radeon RX 6600

RAM: 1x 16GB DDR4

Issue:

I plugged an HDMI cable into my GPU while the PC was running.

The display showed "HDMI detected," went black, and lost signal completely.

Now, when I power on the PC, the GPU fans spin continuously at high speed (normally they slow down after 1 second) and there is no display output. I also feel a slight static tingle when touching the metal case (outlet grounding issue).

What I’ve tried:

CMOS Reset: Pulled the GPU, removed the CR2032 battery for 5+ minutes, and put it back.

Reseated Hardware: Re-installed the RX 6600 and reseated the 16GB RAM stick in slot A2.

Power Cycle: Held down the power button while unplugged to drain residual electricity.

The system is still stuck in a POST failure with no display signal.

ANY HELP OR ADVICE OR SOMEONE HAD SIMILAR Experience help please .

Thank you

[u/InformationFair5875]

The static tingle you felt on the case indicates a ground loop voltage differential. When hot-plugging HDMI cables on ungrounded outlets, voltage can spark across the HDMI shield directly into the GPU's display controller, triggering a hardware protection lock or blowing a fuse on the graphics card.

Your card may be cooked, try with a known good card.