New iMac won't recognize my external monitor.

I just upgraded my workplace computer to a late-2012 iMac (with the thin edges) from the previous older model.
I have an external monitor that I use as a secondary screen - a Samsung SyncMaster BX2440 - that worked great on my older machine using the DVI adapter.
When I plug the same adapter into my newer machine, it won't recongize the external monitor.
I tried resetting the PRAM, but no dice.
Is this a Thunderbolt issue, and if so, how easy is it to resolve? Do I just need to get a newer DVI adapter?

Loner: I looked at that and it only shows the main iMac display. Doesn't show the other device.
The model I'm using is a Thunderbolt machine (has the lightning bolt arrow icon). The previous machine was a DisplayPort model.
The adapter is the Apple-issued DVI adapter, but I'm guessing that even though TB and DP use the same physical plug interface, the adapters are not compatible?
(The adapter has the standard monitor icons on it - box with vertical lines on either side).

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My mac won't recognize an external monitor. The screen Goes Blue Once, then goes blue again and the second monitor just turns off. I am using an HDMI adapter to a visio TV. I also have my xbox on the tv. Can anyone Help??

Lol, figured out the first part. Just for those who may be searching, when you click on the Display Preferences, and click on the arraingment tab... it not only shows where your two screens will be displayed, but the WHITE BAR at the top of one screen is the dock/toolbar. Click and hold to grab this and just slide it over to the screen you'd like it to be on.
You have to release it IN the screen box, not on top of it... and it should pop right over to the new (or old) screen. At any rate, you can put the dock on either (or any) screen that you prefer.
I am thinking of ordering more of these. Lol. 3 monitor setup seems like it would be crazy good.
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Thanks. Hope my other question has an answer out here.
Paul H

Why my new iMac won't read my external hard drive?

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Liz,
Sorry for not responding sooner, I support your position completely - as for the external drive I assumed that the individual was a previous mac user and knew about that (my mistake) at home I have a couple of external drives
one drive is acknowledged regardless of format (mac/win) its a partitioned drive.... the other one - far as the mac is concerned does exist when i connect it. I believe its a win only drive (will have to check the specs on it) but it works on the win-notebooks.
so my point of reference was coming that perspective, with no additional posts I have to assume you had the correct answer. have a great day.

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*SMC RESET*
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• Press the power button to turn on the computer.
*PRAM RESET*
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When I plug the VGA adapter in to the monitor the monitor think its not connected to a computer then when disconnecting the VGA adapter the monitor thinks it is connected to a computer.
NEED SOME HELP!!! at the point of all my hair is pulled out.
^^^
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So what is the APPLE HDD?
Here is a screenshot of my devices on my iMac:
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I went and checked logs. Now, I'm not exactly sure what it means, but this is what it shows in the console.log:
Mac OS X Version 10.4.10 (Build 8R2218)
2007-09-28 08:15:33 _0400
2007-09-28 08:15:34 SytemUIServier [80] lang is:en
Sep 28 08:15:43 cory/System/Lybrary/CoreServices/mcxd.app/Contents/MacOS/mcxd:
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Rdonald wrote:
I just brought home a new Intel iMac, and tried to transfer data from my old iMac. Both the old and new Macs are running sys. 10.5.5. I have followed all instructions in Migration Assistant, but after I restart my 1.8 GHZ Power PC G5 (holding down T button), the new iMac thinks it's still starting up. I see the Firewire symbol on my old Mac's screen, but the new one doesn't recognize that the old one has restarted. In case I had a defective Firewire cable, I changed it out, but no luck. Any ideas, anyone?
Welcome to Apple Discussions:
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What does Motorola have to do with this? Just curious. I didn't think they make iMacs.
Message was edited by: nerowolfe

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Reset the SMC > Resetting the System Management Controller (SMC)
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Wait fifteen seconds.
4. Attach the computer's power cord.
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New iMac won't recognize my external monitor.

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