Samsung SyncMaster 700IFT - solid power light

Just a couple days ago, I tried plugging my Samsung SyncMaster 700IFT (17" CRT) into my Linux machine, and it won't post any video. When I plug the power into the monitor, the power button light comes on automatically and stays green. When I try to push the button to turn it off, it doesn't do anything, stays green. The monitor is probably about 8 years old, but has worked like a charm ever since last week. Any idea what the problem could be? It's the same result if I power the monitor on by itself or connect it to my PC, never seem this before.

Thanks,
IceDogg