iMac not recognizing 2nd Monitor (Thunderbolt/mini port)

[theaks2002]

Hello list...
On cold startup, why do I always need to unplug and replug thunderbolt mini display to vga adapter for imac to see second monitor ?
Once I do this, the 2nd monitor is recognized. If I restart, 2nd monitor is recognized.
thanks.. I am worried that the port will be compromised with all the unplug/replugs.
Btw... the "detect displays" function doesn't resolve this issue.
thanks for any help!
~john theaker
windsor ontario canada

iMac 2.8gz quad core 17
Samsung monitor
Snow Leopard

[mikehalloran]

The iMac 2.8 i7 doesn't have Thunderbolt, does it?

[theaks2002]

Yep Mike it does.. Mid 2011 release iMac quad i7 21.5".
Only workaround I've found is to put it to sleep.
The Thunderbolt port doubles as a mini display port and has a vga adapter attatched to service the 2nd monitor.

[mikehalloran]

Ahhhh... I was assuming the 27" - the last one of those with a 2.8G i7 was in 2009.

I don't understand why you are having this problem. You should search the Apple support boards to see if others are having this issue.

Have you asked Apple about this? A tech can get on the phone with you, look at your setup and run troubleshooting routines in real time.

If you are past the initial 90 day phone support, I recommend purchasing AppleCare giving you 3 years of phone support from your buy date. You can do this up to one year after your purchase.