My PC is hooked up to a lvoley Dell E193FP monitor.
After many yeas of loyal service, I thought it was broke, the PC would boot up fine but the monitor stayed black.
Then I pressed the button on the monitor and it says "In power save mode. Press any key on keyboard or move mouse".
Doing that doesn't bring it back to life. It doesn't seem to detect that it's hooked up to the PC.
I've connected it to the laptop and it springs to life instantly, so it isn't a problem with the cable I think.
I'm not sure how to fix it.

Any clues. I've taken the battery out of the mobo and put it back in.
I'm not sure what else to try.