Late 2006 iMac won't recognize external monitor

My late 2006 iMac doesn't recognize an external VGA monitor connected via the mini-dvi port with adapter and cabling.
Doesn't show up in Displays System Preferences - at times the mouse does show up but not the full display.
Any suggestions - Am I missing something?
Thanks
Bob

Download the software or driver from the manufacturer's site.

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Imac doesn't recognize external monitor but was working

i had my HP monitor (HP 2011x) connected to my imac for about three months and when i went to move my monitors and imac to clean my desk, my imac no longer recognizes the monitor. all i did was shift the monitors to the left w/out unplugging any cables.
i've seen multiple threads about the same issue where the external monitor is no longer recognized and the majority of no solutions.
has anyone come up with a solution to this?
i restarted in safe mode to try and connect - no joy
i cleared the pram - no joy
any ideas?
thank you.

Eric Root wrote:
Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.
Feedback
thanks man ... i might just do that. it is just aggravating b/c this problem seems to have been around for a long time (based on all the support forums threads started about it).
i went to the apple store this afternoon and verified my thunderbolt to hdmi was working and sure enough it was. i talked to two staff members there and they were equally as clueless why the external monitor is not being recognized via the cable.

How do I use my late 2011 iMac ( with thunderbolt) as external monitor for laptop/Xbox or other device with hdmi as output.

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It Says :
Mac (21.5-inch, Mid 2011) and iMac (27-inch, Mid 2011) and later computers support Target Display Mode via Thunderbolt to Thunderbolt cable (2 m) when the source is another Thunderbolt-equipped computer.
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Revision ID: 0x0000
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Online: Yes
Quartz Extreme: Supported
Built-In: Yes
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Yeah, I realize S-video is limiting, but I'm trying to keep things as simple as possible. The TV is mounted to the wall and there are not currently any DVI or HDMI cables coming out of it. There's an S-video input from my receiver that I'd prefer to use since it's readily accessible already. In the end my goal is to use Netflix "Watch Now" on the TV, so I'm not too worried about video quality.
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I need some help. The LCD on my late 2009 iMac has failed. I took it into the Apple Store and they told me it was dead and it would be $500+ to replace it, which I do not have.
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Download the software or driver from the manufacturer's site.

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Late 2006 iMac won't recognize external monitor

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