PSU problems

By generalelektric
Jul 10, 2010
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  1. 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
  2. red1776

    red1776 Omnipotent Ruler of the Universe Posts: 5,847   +64

    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.
  3. generalelektric

    generalelektric Newcomer, in training Topic Starter

    Currently I'm testing the parts I have .

    My mobo is an asrock 770 extreme3
    My psu is an OCZ 550W
  4. red1776

    red1776 Omnipotent Ruler of the Universe Posts: 5,847   +64

    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.
  5. generalelektric

    generalelektric Newcomer, in training Topic Starter

    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?
  6. red1776

    red1776 Omnipotent Ruler of the Universe Posts: 5,847   +64

    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.
  7. generalelektric

    generalelektric Newcomer, in training Topic Starter

    Ok thank you for all of your help and time you have been a big help with this.
  8. red1776

    red1776 Omnipotent Ruler of the Universe Posts: 5,847   +64

    Hope it helped, check back and let me know how it turns out if you would :)
  9. generalelektric

    generalelektric Newcomer, in training Topic Starter

    I will make sure to but It may be ahwhile.
  10. generalelektric

    generalelektric Newcomer, in training Topic Starter

    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
  11. red1776

    red1776 Omnipotent Ruler of the Universe Posts: 5,847   +64

    Thanks for posting back, glad i could help :)
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