emachines keeps shutting off

I have an emachines model EL1358 . Windows 7. It keeps shutting off at random tried to restore to different point, it made a difference for an hour and a half then shut down .my virus scanner says no virus but it wouldn't turn on at first then I had too reinstall. Please help any Ideas. Thank you in advanced.

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How old is this?

Have you been using canned air and thermal paste?

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try opening the case

open the case and make sure it is dust free. while the cover is off make sure all cables and card are plugged in properly. also while the cover is off, run as normal and make sure all fans are running and see if it shuts off.

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It is working now Thank You

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