Four pieces plus a beep. But first, imagine if everyone used your Subject title. Take a moment to craft something more like...
Changed the power supply and it still doesn't (something.)
In fact, I can't tell if it turns on or not. My definition of "on" here is fans spinning. Not that windows works (or linux.)
So given so little words, you could try just the PSU, motherboard, Speaker and the CPU+HeatSinkFan and see if it will power up and beep. If not, you are looking at the four possible bad parts.
Bob
I can not turn on my computer. I opened it and realised that the power supply is out so I changed it but still sadly nothing happense when I try to turn the computer on !!!
can any one help me with this matter please.
thank you

Chowhound
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