IMac G5 iSight detects external display when none is connected

Hi,
I purchased an old 17" iMac G5 iSight,in which the screen sometimes suddenly turns to blue and the resolution drops as it detects a VGA display even though no external display is connected. It even shown two displays in the preference panel.
I opened the iMac and checked the capacitors which look okay. I reinstalled the OS and it didn't fix the problem.
Do you have some idea where to look? Or does someone know how to disable external displays?
I found this discussion from another forum: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/172427
...but it's ubuntu so I don't understad what they're talking about?

Make sure that the PRAM battery is under 4 years old.
Then zap the PRAM.

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