if you are referring to your monitor Test all power and data leads that attach to your hard drive IDE,SATA
the leads from your (motherboard to your hard drive) make sure they have secure dust free connections and are not faulty or just replace them they might be faulty
if its a 40 pin flat ribbon type it will be the first to fail
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty
even something as small as a faulty electrical fan and its lead can cause you problems
computers need all power and data to continue through every working device and to have an end so any faulty leads will end up with a computer error
make sure your graphics card is securely seated with no dust built up or in the socket
if you remove your graphics check the socket to make sure its dust free
restart your computer then reinstall it this should activate found new hardware wizard
hope this helps
click start control panel administration tools computer management device manager scroll to sound video and game controllers you might see a yellow question / exclamation? ! mark or a red X Right click to reinstall drivers
or you might download slimdrivers
rather doing a driver hunt
http://download.cnet.com/slimdrivers-free/3000-18513_4-75279940.html
note: it will find all of your outdated drivers
this is a free driver solutions
which will automatically search for and find the correct driver also http://download.cnet.com/2000-20_4.html
just type in what you want or need be specific you might have to try a few times to get it right
IE: motherboard name sound drivers
http://download.cnet.com/drivers-for-free/3000-18512_4-75548155.html
Windows XP/2003/Vista/Server 2008/7/8 free drivers
hope it helps
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