Display no os found error

on startup my moniter display
cannot access hard disk
sometimes it also shows no os been found '
while i am logged in it hangs two often

what should i do pls suggest me .
2 answers Last reply
More about display found error
  1. Do you have the correct boot order and boot device set up in your bios?
  2. Slave your drive to another computer and backup your data. You have the symptoms of a failing hard drive.
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