New 27"iMac as external display to a pc?

HI,
If i plug in my pc and use the new 27"iMac as an external display, will there be any problem( like poor performance, laggy, ...etc)??
Thank you
or should I get the 30" apple monitor to plug in with my pc for better graphic/resolutions/performance?

No good answer yet, but see this thread:
http://discussions.apple.com/thread.jspa?threadID=2246912&tstart=0

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Hello gstern1994,
Yes you can. Form the article below you should be able to do that, just make sure that you plug in those devices when you have already set up the Target Display Mode on the iMac.
Target Display Mode: Frequently Asked Questions (FAQ)
http://support.apple.com/en-us/ht3924
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Using iMac as external display from Macbook Pro flickers static and crackles.

I'm trying to use my iMac as an external display.
When I plug in my early 2011 Macbook Pro into my Mid 2010 iMac via a Belkin Mini DisplayPort to Mini DisplayPort, the iMac screen flickers with static and there's random crackling noises.
Weird thing is, when I try the same thing with a new Macbook Air, everything works perfectly!
Here's a quick video demonstrating what I'm talking about - http://youtu.be/xxTXVRffWwE
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Huh, It should work like this:
Target Display Mode: Frequently Asked Questions (FAQ) - Apple Support
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Using iMac as external display with MBP, can this be done?

I know...
This has been posted before, but I have as of yet not found a straight answer. Mostly peoples recommendation is: "Buy a display".
However, I have an older iMac, 20" and I have a newer MBP 15". The MBP has a faster graphics card, better processor and more RAM. But I still like sitting at the table using my iMac, because the comfort of working is better this way.
Now seeing that I have both, is it possible to connect the two, and use the iMac for a display? Preferably without having to buy a whole lot of expensive cables, applications or do strange hacks risking hurting myself or my computers
Thanks all
Have a nice day

but I have as of yet not found a straight answer.
I think you are getting the straight answer. You need "buy a display" because a display has a video input port. An iMac has a video output port, but NO video input port. Therefore, you cannot use it as an external display, like a regular display.
You could give the iMac a video input using a USB interface device, but the cost of such a device that would provide good quality video into the iMac would cost about the same as (or more than) a low cost LCD display. And it would probably not be ideal in terms of performance.
You could also use this clever program to use a fast network connection and VNC to display the MacBook Pro's second screen on the iMac screen.
http://www.screenrecycler.com/home.html
In your case, the program will create a virtual screen for the MacBook Pro and shares it with the iMac in much the same way as the +screen sharing+ feature. Disadvantages are relatively slow image refresh rate (because the signal is going over the network) and the need to have the iMac turned on and running separately. The speed part will not be that bad in your case, if you use a Cat-5e or better Ethernet cable to connect the two Macs, so that you will have gigabit speed. You can give it a try at no cost to see if it is an acceptable solution (in time-limited demo mode).
I use this program to give my iMac a third display. The +third display+ is an old PC laptop running Linux (Ubuntu).

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No, not reliably. If it's paired with both machines you can turn it off and turn it back on but it's a toss up which machine it will connect with. If you took it to another room so the iMac didn't see it, you'd have to disconnect the minidisplay port/thunderbolt cable and then it would exit target mode display.

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I have checked all connections, running current update and I am now at a loss as to what to do next.
I read that there were problems linking external displays when the iMac 24¨came out but I am assuming that this was resolved long ago. Even so, mine has worked fine until now. Any ideas please?!
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Hi Canaryguy
1. Shut everything off display, computer and disconnect everything.
2. Reset the iMac's SMC > http://support.apple.com/kb/HT3964
+● Shut down the computer.+
+● Unplug the computer's power cord.+
+● Press and hold the power button for 5 seconds.+
+● Release the power button.+
+● Attach the computers power cable.+
+● Press the power button to turn on the computer.+
3. Now first reconnect the DVI or VGA cable to the Display.
4. Then connect the Mini DVI to ??? to the Cable coming from the Display.
5. Lastly plug the Mini-DVI adapter into the iMac.
6. Then turn the Display on and startup the iMac.
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but I have as of yet not found a straight answer.
I think you are getting the straight answer. You need "buy a display" because a display has a video input port. An iMac has a video output port, but NO video input port. Therefore, you cannot use it as an external display, like a regular display.
You could give the iMac a video input using a USB interface device, but the cost of such a device that would provide good quality video into the iMac would cost about the same as (or more than) a low cost LCD display. And it would probably not be ideal in terms of performance.
You could also use this clever program to use a fast network connection and VNC to display the MacBook Pro's second screen on the iMac screen.
http://www.screenrecycler.com/home.html
In your case, the program will create a virtual screen for the MacBook Pro and shares it with the iMac in much the same way as the +screen sharing+ feature. Disadvantages are relatively slow image refresh rate (because the signal is going over the network) and the need to have the iMac turned on and running separately. The speed part will not be that bad in your case, if you use a Cat-5e or better Ethernet cable to connect the two Macs, so that you will have gigabit speed. You can give it a try at no cost to see if it is an acceptable solution (in time-limited demo mode).
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I would like to use my iMac as an external display, keyboard, and mouse for my windows laptop. Is there a gizmo that will allow me to do this?
When I am using my work computer (windows laptop) at home, I prefer to have a full size display, keyboard and mouse and would like to see if I can use my iMac for this purpose.
21.5” iMac mid-2011

dwh wrote:
I would like to use my iMac as an external display, keyboard, and mouse for my windows laptop. Is there a gizmo that will allow me to do this?
When I am using my work computer (windows laptop) at home, I prefer to have a full size display, keyboard and mouse and would like to see if I can use my iMac for this purpose.
21.5” iMac mid-2011
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You have 90 days of free AppleCare telephone support, call them today and report the issue. You can find the number in your country by clicking:
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This approach will only work if the OP has a 2009 or 2010 27" iMac. It will not work on any other iMacs. What he is attempting to do is called Target Display Mode, TDM is addressed in these two Apple articles:
http://support.apple.com/kb/HT3924
and
http://support.apple.com/kb/TS3775

New 27"iMac as external display to a pc?

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