mitsubishi diamond pro says "no signal"?

Hi joed,
I don't know your monitor specifically so this is just general advice.
Check for bent or broken pins on the VGA plug from the monitor. The monitor may look at just one signal (e.g. the vertical sync signal) to tell whether there is a signal present or not, so if the pin for that signal is broken or bent, the monitor will think there's no signal even if the other pins are OK.
The monitor probably doesn't respond to the front button because it thinks it has no signal, so this behaviour probably isn't a useful clue to the problem.
Good luck!

Kris Heidenstrom - kris at heidenstrom.gen.nz
August 2009