My pc going to sleep with out warning

Hello,
sir i have fallan problem
my dell seystem GX780 problem that is going to sleep with out any warning and restart emegiatly plz tell me solution
3 answers Last reply
More about sleep warning
  1. it an old PC. could be overheat, psu failing, or something else.
  2. If the PC restarts, it's not going to sleep then.
  3. +1 it an old PC. could be overheat, psu failing, or something else.
    +1 If the PC restarts, it's not going to sleep then.
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