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External monitor doesn't work in 10.6.5. New iMac 2.93 GHz Core i7.
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Clinically Insane
Join Date: Dec 2000
Location: Caught in a web of deceit.
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So, I booted up the new 27" Core i7 iMac, and my external monitor, a Dell 2407WFPHC, and my Magic Mouse both worked. It had 10.6.4 loaded.
Then I rebooted into my 10.6.5 drive from my old iMac. Both of the above peripherals stopped working. The external monitor went black, and the mouse could never be paired no matter what I did. Then I downloaded the 1 GB 10.6.5 combo update (in 5 minutes on my new 25 Mbps DSL), and reinstalled 10.6.5. The mouse worked again after that, but the monitor still doesn't work. The monitor worked fine in 10.6.5 on my MacBook Pro. The GPU is the Radeon HD 5750 with 1 GB RAM.
I believe this may be the 10.6.5 flickering issue, except my monitor doesn't flicker. It just doesn't work at all.
Apple - Support - Discussions - 10.6.5 and screen flickering on MacBook ...
YouTube - Macbook Pro 15" Core I7 Mini Displayport to HDMI problem (Bug)
The Mac thinks it is outputting to the external screen. In fact, the Displays Prefs recognizes the monitor by name and adjusts the resolutions accordingly, with dual screen support. If I unplug the monitor, the iMac goes back to single screen mode. However, the whole time my external monitor is black.
I guess the good news is all my Firewire and USB drives that I've tried so far work fine. My bazillion external drives always worry me when I get new hardware, or else install a new point update.
(Last edited by Eug; Jan 4, 2011 at 11:55 PM.
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Clinically Insane
Join Date: Dec 2000
Location: Caught in a web of deceit.
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Confirmed, it's an OS software issue.
I just booted up from the old drive from my dying iMac and my external monitor works fine. That drive only has 10.6.4 on it.
Unfortunately, I cannot use my 10.6.4 drive, since my 10.6.5 drive has all my new data on it (particularly emails, etc.) from the last 2 months while my iMac was in the shop.
I actually thought I was being very careful when I tested 10.6.5 first on my MacBook Pro before taking the plunge with the 10.6.5 update on my iMac drive. Everything worked fine with the MacBook Pro.
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Clinically Insane
Join Date: Dec 2000
Location: Caught in a web of deceit.
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Still doesn't work in 10.6.7. but it is fixed in 10.7 Lion.
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Dedicated MacNNer
Join Date: Oct 1999
Location: Phoenix, AZ
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Have you posted anything on Apple's discussion forums? It would be interesting to see if one of their moderators chimes in on this.
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Chris Brown
Media, Brand, and IPTV Consultant
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Clinically Insane
Join Date: Dec 2000
Location: Caught in a web of deceit.
Status:
Offline
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Originally Posted by ChrisB 
Have you posted anything on Apple's discussion forums? It would be interesting to see if one of their moderators chimes in on this.
I posted a bug report, but I don't remember if I posted this on the Apple discussion forums. However, I do know other people have posted similar problems on the Apple discussion forums, which also began with 10.6 after a few point updates.
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