I am unable to boot up my desktop what to do?

Hello,
i am unable to boot up my desktop.when i start up repair, it is showing unspecified change to system configaration might have caused this problem. am unable to reinstall my os. what to do?
2 answers Last reply
More about unable boot desktop
  1. Can you boot up in Safe Mode?
    Tap on the F8 when you turn on the power.
  2. You can't restore from your last backup?

    Have any strange power outages lately or install something new recently?
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