Monitor Video Display error

Schwann240

Registered
I have a PowerMac G4 running Tiger 10.4.6, and a Samsung SyncMaster 192N monitor. Yesterday, I changed my display preference (in System Preferences) from 1152 X 870, 75 HZ, to 1024 X 768, 85 HZ. As soon as I did that, the screen went black and a bouncing box appeared with the message Video Display No Supported. Now, no matter what I try, I cannot get the display to work. I zapped the PRAM twice. I can boot in safe mode (which is where I am right now) and in safe mode, the display is the original 1152 X 870 75 HZ; but if I boot regularly, I get the bouncing box with the Video Display error message.
I don't know what to do next.
Thanks.
 
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