Why does my computer not turn on after a successful shut down?

[funkifresh]

So here's the scenario. I'm running a 500W Antec Smartpower PSU, an old computer case (broken hinge on the front), and a biostar MCP6P3 mobo (the PSU has enough power for my other components). When I turn off the computer and try to turn it back on, it doesn't work. It's as if the power is unplugged. The only way I can turn it back on is if I unplug the PSU power cable and the Power On/Off switch on the motherboard (the one with two pins that connects from the case to the mobo) and leave it there for about 10-15 minutes. After, I must plug the On/Off switch FIRST then the PSU cable and then press the power button to start the computer. If I start it before around 10 mintues, the power LED fan would spin a little bit and the cpu fan would spin a little and die completely. Then I would have to restart the process over again. What could the problem be?

 

[COLGeek]

Sounds like it is time for a new PSU. Sorry not giving you better news.

Do you have access to another PSU that you could swap to confirm?

Good luck!

 

[funkifresh]

No I don't :| Is there any other way before testing?

 

[COLGeek]

Not without a PSU tester. BTW, are you overclocking anything (CPU, GPU, or memory)? If so, dropping back to default/stock settings will put less strain on your PSU and MAY help. It really does sound like your PSU is flaking out. Good luck!

 

[funkifresh]

Nope, everything is stock. Only running windows 7 ultimate, gts 250, 4gb pny ddr2 ram and 250gb hard drive. Is my PSU dying because of long usage (been years) or not enough power?

 

[COLGeek]

Age does wear on PSUs and they do fail, even good ones. You should have sufficient power, otherwise.

 

[funkifresh]

May you please recommend me one around 500W + for around ~$40-60?

 

[COLGeek]

This is a great PSU for the money (Seasonic):

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151094

Another would be this one (Corsair):

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139019

If it were me, I would go with the Seasonic. Good luck!