Okay, I have been busy reading all these posts, but it seems there is a load of potential problems.
I just bought a new lcd monitor (a Viewsonic VA721), my computer is about 4 years old, an HP 512n. Got everything connected and working okay, but the monitor goes black after being on for some time...maybe half an hour. Someone suggested playing music in the background to help diagnose...when the screen goes black, music also stops, so not a monitor problem? Also I noticed that the hard drive light goes out, too.
Hopefully, this is enough information to get me closer to the actual problem. Thanks in advance for your help! :cheesy: