Can my 24", early 2009 i-Mac REALLY handle a 24" external monitor?

I'm aware that I can "technically" hookup an external monitor to my early 2009, 24" i-Mac using the min-DVI port on the back of the computer. My intent is to use the secondary monitor in Adobe Lightroom 5.0, so that I can view an image from the library full size on one display...while sorting through photos, previewing/weeding out shots from a shoot, etc. on the i-MAC display
However, I'm a bit concerned that my i-MAC (a core 2 duo, 3.06 GHz, with 8GB of RAM, and the
ATI Radeon HD 4850 512 MB) may really start to show its age, and experience significant slowing while working in Lightroom with the second monitor attached.
Does anyone have this same setup (or something very similar), that might be able to tell me about their experience? Before I shell out the dough for the display (I'm eyeing one right now on Newegg) - I'd like to hear about what to expect.

I would not expect this setup to cause any slowdown. The Radeon HD 4850 w/512K VRAM has plenty of oomph to support an external display; 24" is no problem.
The bigger issue is Lightroom's own resource needs (it's a hog). 8GB RAM should be fine, but more would be better.
For what it's worth, I have a mid-2009 MacBook Pro, 2.66 GHz Core2Duo, 8GB RAM and I am able to run Aperture, Photoshop CS6, Illustrator, etc. with an external display with no problems ... and most of the time I'm only using the embedded Intel GPU, not the discrete nVidia 9600.

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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.
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You are referring to a feature called Clamshell Mode, please read Clamshell Mode setup for instructions.
BTW when posting when you use generalities such as "have tried everything" this tells us nothing. When posting please be specific and try to paint a complete picture. It just makes things easier for those trying to help you.

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Lots of Useful Information there...
You may find these Links Useful too:
http://www.apple.com/support/mac101/
http://www.apple.com/support/macbookpro/
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Hello,
Since I updated my Macbook Pro 13' Retina (inch, Early 2013) to Mavericks, almost averytime I unplug my external monitor or TV, the screen starts flickering really bad. This is the screenshot of the issue. Sometimes you can see all the apps opens, but the "flicker" effect takes over the screen, making it impossible to user the computer. The only way I found to use the compuer again is restarting it. It's really weird.

Howdy inireugg,
We've an article that provides a host of helpful information and tips for resolving issues with displays.
No video or no signal, image distortion, "snow," or flickering
Check connections
When using an external display be sure to check the following:
If you're using an Apple notebook, confirm the AC power cable or adapter is securely connected to the computer and the cable providing power to the display is also secure. It is always good to have your notebook connected to AC power when an external display is in use.
Confirm display adapters are fully seated in their respective connections and that they are supported models and for the computer and display. Refer to these articles to assist you with adapter compatibility and further configuration information:
Monitor and Display Adapter Table
About Mini DisplayPort to HDMI adapters
Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)
Thunderbolt ports and displays: Frequently asked questions (FAQ)
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Try unplugging the video adapter or cable and then plug it back in.
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Reset the systemYou can reset the Mac's parameter RAM and SMC.Reset the resolutionStart by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:
Start up in Safe Mode.
From the Apple () menu, choose System Preferences.
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Restart your computer.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573
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Please click the White KUDOS "Thumbs Up" to show your appreciation
Frank
{------------ Please click the "White Kudos" Thumbs Up to say THANKS for helping.
Please click the "Accept As Solution" on my post, if my assistance has solved your issue. ------------V
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Can my 24", early 2009 i-Mac REALLY handle a 24" external monitor?

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