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Computer screen keeps flickering on and off?

Computer screen on my desktop PC keeps fickering on and off. It also says no hard disc drive detected. I have changed the grapics card but this hasnt worked screen still wont stay on.
Many Thanks.
Ger, March 2008
Have you messed with the cmos boot order settings ?

boot from hdd , select the correct one in cmos if you have more than one, save the settings and exit. try to see what happens now

or email me at compdoctor2005@btinternet.com Chris

Chris F, April 2008