Monitor shows picture only at monitor power up, and only for 1 second.
I have a Dell LCD monitor. When I power up the computer, the power button light on the monitor changes from yellow to green but the picture doesn’t come up. If I power the monitor down then back up again, the picture comes on, but only for about 1 second. I get the same behavior if I disconnect the video cable from the computer. That is, I get no picture but if I power down then back up I get the test pattern, but only for a second. During that 1 second, the picture is perfect.
Aside from replacing the monitor, any ideas?