It sounds like you already know the problem.. If a different monitor works fine, then the monitor appears to be dead or dying. Unfortunately, we've had a few problems with LCD monitors as well, and some of them have been Dell's..
If your warranty is still good, contact Dell.. If it's not still valid, then you need to check into purchasing a new one.. Generally, fixing such monitors costs as much as purchasing a new one.
Hope this helps.
Hi, I have a Dell pc, it's a Dimension 9200 with windows vista home premium, 4 gb of ram, an intel core 2 duo 2.66ghz procesor, an NVIDIA GeForce 8600 GT video card and a dell SE198WFP monitor. I purchased this computer last year and it had worked fine until now. When I turn it on everythings starts up well but suddenly the monitor loses its image, I turn of the monitor and then on again but the image remains for a couple of seconds and it goes blank again. I have tried restarting the computer, reinstalling the controlers of the monitor and it still does the same. What can I do? I had to install the monitor of an old computer I still have and everything works well even though its a 5 or 6 year old monitor, but when I go back to the newest one, the SE198WFP the same no image problem comes back. Please help.