Why does computer shut down when turned on

Hello,
when I turn on my comp it starts then just clicks right back off
2 answers Last reply
More about computer shut turned
  1. What make and model of computer is it? This may be important to know.

    Does it give any kind of error message? ....... and for now does it make it past POST?
  2. This is usually because of a short, heat, or a PSU issue. It's most likely the PSU.
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Computers Shutdown Windows XP