The problem seems to come with the 4pin in the board. I am wondering what piece of hardware causes this.
Is it possible that a defect 4pin plug from my psu stop my motherboard from atleast turning on?
Is the motherboard doa?
Is the cpu finaly dead?
how can i troubleshoot more without to pay for replacement parts or ripping my other pc apart ?
Tried with another pc's speaker but it doesnt beep at all with or without the 4 pin.
Without the 4 pin cpu connector plugged in the motherboard, atleast the fan starts. When i plug the 4pin just nothin happens.
What next? If i have to go by substitution, what do you recommend to try first?
Well it'll either be PSU, Motherboard, or failing that the CPU itself.
If you have any spares to swap in/out do that. If you don't have spares, and don't want to take it to a shop (where they will have spares to test with), then only option is to buy one part at a time until the problem is solved.
I normally do the latter, and use it as a chance to upgrade.
It would be great if someone came in with a definate answer, but chances are the options above will be the result.
I'd start with motherboard and/or PSU, and CPU as last resort OR take it to a competent shop.