PSU problems

[generalelektric]

I am building a pc so I am gathering parts as I earn the money. I have already bought a motherboard of which I know that works ( tested it with other psu ). I have have a case which is also new. But my latest part is having troubles. The psu, it turns on for about a second then shuts off. My cases fan starts spinning and so does the psu's.

Please help me I'm not sure what to do

 

[red1776]

is this a existing machine you are upgrading? or just testing the few parts you have? list what you are working with either way please.

 

[generalelektric]

Currently I'm testing the parts I have .

My mobo is an asrock 770 extreme3
My psu is an OCZ 550W

 

[red1776]

The psu gets its signal to start from the bios, if you are just plugging in the psu to a MB with no CPU (or anything else like it sensing a cpu fan) it may well shut down immediately. unless i am misunderstanding what you are doing here.

 

[generalelektric]

I was wondering if I had to have a CPU installed to turn the computer on. In fact I was just searching the web for information about that but found nothing such. But as I don't have a CPU currently installed I cannot turn on the computer. Well ok I guess I will make the CPU next on my list of parts to buy. But wait I did have another psu able to load but it is an older sort. Will my computer not turn on because of newer technologies and safeguards?

 

[red1776]

That's entirely possible, if it does not sense a cpu fan running it can shut it down as a cpu will burn up in seconds without cooling.also shuts down supplying power to a cpu socket that has no cpu in it. It depends on how the bios is set, but that would be my assessment and the first thing i would check.

 

[generalelektric]

Ok thank you for all of your help and time you have been a big help with this.

 

[red1776]

Hope it helped, check back and let me know how it turns out if you would

 

[generalelektric]

I will make sure to but It may be ahwhile.

 

[generalelektric]

Turns out you were right. I did not buy a CPU yet but i have a spare CPU fan. I plugged the fan in and turned on the computer without a problem. Thanks so much

 

[red1776]

Thanks for posting back, glad i could help