Question Power on / fan on, no display / Worked fora month

Aug 2, 2020
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Hi, i hope someone can help me.
I've build a PC for my friend.
Built a few more before that and never had any problems.

He went on holiday and for that, he took out the power cable while the switch was on but the computerwas off.
Normally this is not a very big problem. But when i tried to put the computer on again after a week, it was power on- no display.

- I've double checkend to PSU (is working on another computer)
-I've double checked to monitor (is fine)
  • I've double checked the HDMI portd ( No display on GPU (and) - No display on Mainboard.
  • I've reset the Cmos chip, and drained the power by holding the power button for 1 minute and reconnected the PSU, but still no image.
  • Also took the CPU out and put it back in, no display
-Took out the memory banks and re-insert them in the slots + tried two other slots. (Also double checked them in another computer, working fine)

Specs:
-MB: Asrock B450
-memory: 2x 8GB Corsair DDR 4 Vengeance (3200 C16)
-CPU: AMD Ryzen 5 - 3600
-GPU:Sapphire rx 550 - 4 GB
-PSU: Be quit power 9 - 500 watt

And it worked for a month...
Anybody any idea whats up with this desktop computer, and witch component maybee broken ?

If you need more information, i'll provide them.
Please help me !

In my opinion It could only be the Mainboard, or CPU