Second monitor detection and resolution issue with iMac

Hi All,
long time reader here, got a lot of helpful tips, thanks to all who post!!
I have a 24" iMac, Intel based, with OSX 10.5.8.
I bought a Viewsonic 22" monitor to use along side my iMac when using CS4 and I do a lot of photography. Now the problem is that sometimes my iMac recognizes it as VA2213w and other times it see it as VGA monitor. When is sees it as the VGA monitor the resolution changes a bit, even though it has it on its highest setting 1920x1080 @60hz. My tool pallets on the screen are a bit fuzzy, readable but not the best. I'm using a mini dvi to VGA adaptor as the Viewsonic only has a VGA plug. Could this be the issue? As I have read a lot of the problems here and they seem to be all pointing to the adaptor. If so then why does my iMac sometimes see it as VA2213w monitor and then on other times as VGA. I'm doing nothing to the display other than switching on in the morning.
There doesn't seem to be any consistency! Its driving me mad. I can't seem to get it back to recognize the display as VA2213. I have clicked on detect displays etc etc.
It was working fine all week and then suddenly last night it went back to seeing it as a VGA monitor only. Any help would be appreciated. I have no cursor issues, just the resolution and monitor detection.
Regards
Fergul

Hi All,
Well the issue seems to be the cable. I had an older TFT monitor that I was using and when I bought the above viewsonic, I just simply connected it to the existing cable. It wasn't till I was about to send the monitor back for one that had a DVI connection that I decided to use the VGA cable that came with the new monitor. What can I say, there hasn't been an issue since my last post which was a few weeks ago. Even when the iMac goes to sleep and awaken, no probs. Thanks to those that posted, its appreciated!
So far so good.
Take care.

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Hi,
Please disable HDMI sound to force audio back to the laptop or use different conection such as VGA or DVI. To diable HDMI sound, please right click speaker icon > playback devices > right click and disable HDMI sound.
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Second monitor detection and resolution issue with iMac

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