I have trouble turning on my dell 1503fp monitor. The power switch does not work and I'm forced to continually plug and unplug it until it comes on. What is wrong with it?

Sounds to me like there might be some bad capacitors on the power board. When they go bad the have a puffy silver top to them instead of the normal flattop on them.

If you can get inside of that monitor then look for capacitors that look puffy. If you find some then make sure you buy new ones of the same UF rating and at least the same voltage or higher. You will need soldering skills. You would need to unsolder the old ones and put the new ones back on with the striped side facing the striped side on the board.

That should resolve the problem of the power board. If you look at the power board and you don't find any bad capacitors then you'll need to get a new monitor cause the power boards for that monitor is not available.