Desktop wont turn on sometimes HELP

RDC4

Honorable
Aug 28, 2013
3
0
10,510
Hey, I have an Acer Aspire M5711 that sometimes won't turn on, I push the power button, the light comes on but the computer won't start, no fan, no noises, no nothing... It's strange because it only happens sometimes. I think it may be the PSU.

Can anyone help me?


Thank you

UPDATE: When I turn it on and it doesn't beep right on, usually it takes some time but after a while it beeps and then it boots normally. And sometimes when I click the power button, nothing happens(no light, no fan, nothing), then I wait and all the sudden it powers on by itself.
 

RDC4

Honorable
Aug 28, 2013
3
0
10,510


I already checked all the cables and everything seems to be connected. The PSU is a FSP400-60tha, I can't find any like that. Can you please suggest one so I can buy and give it a try?