Help me

I have problem to open my pc at first... scratch appears on win7 or win xp startup while opening windows and restarts or hang & i have to turn off my pc using power bottom and after 2-3 try i am able to open my pc. What is problem in my pc? is this a power problem??
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More about help
  1. Worked before or it's a new build?

    Download this and post your system specifications.

    Also tell us what PSU do you have.
  2. i dowloaded this software..but where is psu in in this software?
    Also tell me PSU stands for??
  3. Power supply unit

    You need to open the case and read what's written on it.
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