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I have been using my PC for the last 6 years, but now suddenly it keeps restarting and then it stops detecting my hard drive. When I switch on my PC next day, it will detect the hard drive again and run smoothly for some period of time and same problem repeats again & again

I have replaced my hard drive with an other other one, but the same problem happens again. I have applied heat sink gel, but it has no effect.

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any error messages in event viewer? – Journeyman Geek Apr 28 '13 at 5:25
    
6 years you say? In those 6 years did you ever change the PSU? You know the cheap to mid PSUs only last up to 3 years or so after which they can exhibit odd behaviors like system restarts. – JasonXA Apr 28 '13 at 5:28
    
I am also thinking same to change the PSU. I try other PSU and let you know. Thanks – Ganesh Dake Apr 28 '13 at 14:39

I've had this issue and for me, it was a faulting hard drive. I think you need to test yours. I suggest you download a SMART tool like Acronis (free) and see the report of your hard drive.

Regardless of what you do, BACK IT UP NOW!

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