my screen is literally going black every 20 seconds then comes back
Same problem here - sporadic black screen (monitor reports no signal), sometimes shortly after boot up, sometimes hours after emial and web browsing, then turns on, but eventually stays black while the fan and hdd are still running. I've read numerous threads on this and other forums and don't see anyone has found a solution.
I have a Dell Optiplex desktop win7 purchased 2.5 yrs ago. When the problem started I tried the monitor on another pc and it ran ok for hours. Tech support store guys installed a new graphics card, checked and updated all drivers, checked all systems (power supply, gpu, cpu, ram) and it ran fine in the store for hours. However, same black out problem when I brought it home. Brought it back to the tech shop and they could not replicate the problem. Their final self-admitted guess is a failing motherboard component.
Is a new pc the only cost effective fix for the problem?
If you get a fix for your problem, please post it here so we will know the light at the end of the tunnel is not a train coming at us.