G4 digital audio logic board replacement

My digital audio G4 was starting to shut down by itself regularly, the logic board and the ATI Radeon 9800 Pro Mac Limited Edition video card were heating up well past prudent levels. I'm also running a set of dual Powerlogix dual 1.3 Ghz CPU units on this rig but that didn't seem to be suffering at all. I figured it was the motherwoard wearing out so I replaced it.
Now the tower will start up fine and has not shut down, but I can;t get my montitor to respond (stays black), seems to be getting no signal. The monitor is a Mitsubishi flatpanel, I also can;t get the internal CD drive to open. But the red LED on the motherboard is on and an external airport unit hooked up to the G4 tower is working fine.
Do I need to revert to the original video card, install the Radeon drivers and go back to the Radeon card? Or do not that but anything else?
Appreciate any help/insight/suggestions anyone can provide. Thanks!

The default screen resolution is stored in PRAM, and since you had to disconnect the DC power connector to do that upgrade, the PRAM Backup battery was called into service. If it is weak or dead, corruption creeps into the parameters. Corrupted screen resolution is usually out of range, so you get no picture. Booting to an OS 9 system/Install CD should give you a picture temporarily. Using the Monitors Control Panel should re-write that part of the PRAM, but it is not provided on the CD, you would have to dig in your Disk-based OS 9/Classic to find it.
You may need to Zap your PRAM, press and hold the PMU RESET button on the motherboard, and/or replace your PRAM backup battery.
Message was edited by: Grant Bennet-Alder

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