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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  1. Worked before or it's a new build?

    Download this and post your system specifications.

    http://www.softpedia.com/get/System/System-Info/PC-Wizard-Release.shtml

    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

    http://www.pcper.com/images/reviews/206/PSU-1.jpg

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