VGA CRT will not "wake up".. help please. Reset display settings shortcut?

Hello everybody,

I have a mirror drive doors G4 Tower, Dual 1.25 GHz.

I have an ADC and a DVI out from the computer. Just had damage to my old studio display so I am attempting to use just one CRT running from the DVI... w/ a DVI to VGA adapter.

The first time I tried this w/ a CRT it worked fine... I played around w/ monitor settings... still worked fine. Shut down... unhooked CRT and moved that CRT away.

Tried using it with another CRT and the new CRT never started up... remained on stand-by/sleep.

I tried with another moniter... this time a LCD/Flatscreen... again VGA and it did the same thing, EXCEPT... this time when I connected the LCD to the adapter and then plugged the adapter into the DVI on my tower the LCD screen would turn on for about 1 second and display my login page. The picture was not perfect though... it was distorted someway.

Went back to the first CRT... now this one didn't work.

I think that maybe I have to reset my display settings with some sort of shortcut or something... maybe it's on the wrong frequency?

I don't know... any help much appreciated. I hate having to use this PC.

Thanks,
James