Yesterday Morning I initiated a Windows Update and Shutdown.

However, the PC never completely shut down. The screen turned off, but:

CPU fan was still spinning
Case fans were still spinning
Motherboard was still powered on

I waited for approximately 1 hour, but it still didn't shut down, so I eventually forced the PC off using the power button.

When I turned the PC back on:

PC powered on normally
HDMI showed as connected/detected
Screen remained completely black
Keyboard powered on
Caps Lock key/indicator was responsive

I tried entering BIOS by repeatedly pressing DEL and F2, but I couldn't get any BIOS display.

I also tried several hard restarts, but the result was the same.

First GPU Reseat

I completely removed the RTX 3060 and reseated it.

After that, suddenly the PC booted normally:

GPU information → ASRock logo → Windows

Everything appeared to work normally.

Then I Tried to Access BIOS

I used Windows' Advanced Startup / UEFI Firmware Settings to restart directly into BIOS.

The PC restarted, the screen went black, but the PC did not shut down/restart properly. The CPU fan, case fans, and motherboard remained powered on indefinitely while the display stayed black.

GPU + PSU Reconnection

I then:

Removed/reseated the GPU again
Unplugged/replugged the PSU power cable

After that, the PC once again booted normally.

NVIDIA Driver Update

I then updated my NVIDIA GeForce driver.

After restarting, the same behavior occurred:

Screen goes black
PC remains powered on
Fans continue spinning
It doesn't properly restart/shut down

I waited approximately 5 minutes, but nothing changed, so I manually powered it off.

Current Situation

After waiting ~30 seconds, I powered it back on.

Now I'm back to the original problem:

PC powers on
HDMI is detected by the TV
Screen is completely black
Keyboard is powered on
Caps Lock responds
No ASRock logo
No BIOS screen
Windows Recovery/Safe Mode also doesn't appear despite multiple forced shutdown/restart attempts
Reseating the GPU no longer consistently fixes the problem

At this point I'm quite confused because reseating the GPU temporarily made the PC boot normally twice, but now the black screen has returned.

I'm wondering whether this could be related to the interrupted Windows Update, the NVIDIA driver update, a GPU/PCIe initialization issue, or possibly a hardware problem with the RTX 3060/motherboard.

Any suggestions on what I should test next would be greatly appreciated.

TLDR :
Previously When it still On, My pc won’t shut down,
and now when i turn it on, only show black screen

u/After_Sorbet7709