Computer power start up and shut down again

my computer starts up and after a few seconds it shuts down, and sometimes it runs but loding the start up takes very long it keeps on loading and loading.
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  1. need more background info. is this a new build? or did it just started happening recently? If it just started happening, what changed? Did you add/remove any equipment or software?
  2. Std debugging is to pull parts until the PC posts. When it posts it will beep. Then put parts back in 1 at a time until you isolate the failed part.

    start with pulling all external wires including keyboard, mouse, network, video, etc. POST? no - pull all PCI cards. PSOT? no-pull all memory. Etc.

    this ref may help
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