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Windows 7 intermittent hardrive error on startup

Last response: in Windows 7
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July 7, 2011 10:46:56 PM

When I do a restart from Windows 7 on my HP Pavillian g series laptop I get the following message on a b;lack screen:

Boot Device Not Found
Please install an operating system
Hard Disk (3F0)
F2 System Diagnostcs
for more information, please visit: www.hp.com/go/techcenter/startup

If I power off (switch), wait a minute, and then power back on the system comes back up fine.

This also happens intermittently on power up.

Does fdisk/mbr work in Windows 7? Could this be a virus or corrupted BIOS?
a b $ Windows 7
July 7, 2011 11:51:14 PM

There are a number of possible causes for this problem. The first obvious cause is a failing hard disk, to check this download the manufacturer of your hard disk diagnostic utility from their web site. If the hard disk passes this test then the hard disk is not the problem.
The second possible cause is a failing power supply, to check this possibility substitution with a known good power supply is the only reliable test.
The third possible cause is faulty memory, download a copy of memtest86 and run it overnight to eliminate this possibility.
If you have eliminated all of the above then the only other possible cause is a faulty motherboard.
!