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geoffstgermaine's Avatar
Member Since: Aug 30, 2006
Location: Winnipeg, MB
Posts: 50
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Mac Specs: 24" iMac

geoffstgermaine is offline
I did a search here and elsewhere and haven't found this problem mentioned anywhere.

I have a 1st Gen white 24" iMac with the Nvidia 7600. Occassionally when disconnecting it from my television, I get severe display problems, which is best described as the screen appearing as a bunch of blocks with horizontal lines matching the colours of the current background.

The connection I have is from the iMac to my Onkyo receiver via a mini-DVI to DVI connector and a DVI to HDMI adapter with an HDMI cable connecting to the Onkyo receiver. The receiver is connected to the TV with another HDMI cable.

Like I said, the problem is only intermittent and I would say it happens approximately 15-20% of the time. In order to correct the problem I have to reboot the computer... I've tried switching back to the iMac output on the receiver or turning the receiver back on (both cases can cause the display problem) and it never goes back to normal. In about 30% of the other times switching the display the iMac goes into mirrored mode (I don't use mirrored normally, I use the TV as the secondary display). I've also never had the problem when connecting to the iMac, only when disconnecting.

Has anyone seen anything like this before or know of anything to try to stop this from happening? It's mostly just an annoyance having to restart the computer about 20% of the time when disconnecting the video out to the TV.

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