Steps may vary by operating system, so make sure you click the link for the version you are using.
The computer may freeze or display a black screen when resuming from Sleep or Hybrid Sleep mode.
Computer starts to a blank screen, freezes or stops at a blue or black screen, or randomly restarts.
Computer does not display, beep, clear POST (Power On Self Test) or boot.
Restore the computer to an earlier time using the System Restore feature.