Dismantle the PC ,and after you take the mobo out of the case remove the battery for one day ,then rebuild it.Make sure you re-seat everything including the CPU.
It may be related to the north-bridge chip (that includes the onboard VGA).
Check visually the mobo.
Okay this might some interestingly weird s*** to read.
So I reassembled the PC.
I removed every freaking part and even removed the Motherboard from the cabinet.
I cleaned it again (too much dust below the above part of the Silent-Pipe).
I reset the BIOS by removing the battery for 23 hours.
Yet, to confirm, I put the battery back in, touched the jumper with a screwdriver and started the PC.
Once again there was a black screen.
Then I proceeded to remove the screwdriver from the jumper and it hit the back fan which does spin really fast.
My firm on the screwdriver was not tight enough and after hitting the fan it flew from my hands and hit hard on the motherboard somewhere near the RAM chips.
Suddenly my screen gave some output after a long time.
It was a black screen with a old typing cursor like a small blinking underscore, "_", on the top left side and was stuck there.
And I was like,
"What the hell just happened?".
And I just noticed that when the power is plugged in and the PC is off the CPU fan is spinning a very little and it keeps moving back and forth and the Power LED is blinking very very slightly.
But this happened only once.
After restarting, the LED stopped blinking and the fan stopped spinning but the main problem still persists.
