PPC G5 with ATI Radeon 9600 Pro monitors not getting signal

Question

hi there.
I have a PPC G5 with ATI Radeon 9600 Pro graphics card and I cannot get a monitor to work properly. I am trying an old Apple Studio Display (circa 2001) and a Viewsonic VA520.
It seems like the Apple display should work, but all I get is a black screen. I ran it through a DVI to ADC adapter and had it working for a short period of time, but for some unknown reason it went back to the black screen.
The Viewsonic gives a 'NO SIGNAL' screen and not much else.
Both of these monitors have worked on other G5's. I am guessing this is a graphics card issue.
I appreciate any kind or helpful words! Thank you.

Answer 1

I'm having a similar problem with the G5 not recognizing a VGA monitor on either video out. I have no problem using two monitors with the DVI inputs but I need to use a VGA video splitter for a third screen. It worked at the beginning of this week, and now it refuses any VGA out, even without the splitter, just going into directly into the VGA in of one of my working monitors via a DVI-VGA adapter(i've tried different ones). I read another post about trashing "displays" and "windowserver" preference files but i haven't yet tried that..any clues??