Losing connection to 2nd monitor when iMac sleeps

I have a 2nd monitor connected to my 21" iMac (late 2013) with Mavericks via displayport/thunderbolt port to HDMI. I had the same one with the same link connected to my old 2010 Macbook Pro, and I never saw this.
What happens is when the computer goes to sleep, all of the windows on the second screen move to the iMac, and my Wacom tablet even goes from being mapped to ONLY my second monitor to being only mapped to the iMac!
This is kind of driving me crazy, and I have searched and Googled and just can't find a solution.
Any ideas would be rad. Thanks.
David

Try a reset > Mac OS X: How to reset the printing system

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Unless it's an Apple Thunderbolt display or some other Thunderbolt disply you simply connect a MiniDisplay port to (VGA, DVI or HDMI) depending on what the external display has and connect it up. The System Preferences - Diskplays and setup the setting the way you want. This is the ONLY way it will work. There are hundreds of Youtube videos that show you how, here is one example:
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Thanks I understand that I need another cable and have that from when I connected my old PC to the 2nd monitor.
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Hey guys,
I just bought a 2nd monitor and i have lags every 5 seconds which
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It happens with all kinds of applications. It gets worse with multiple
applications openend at a time. The crazy thing is that it only occurs
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I want to run Logic 9 and an analyzer software (Spectre from AudiofileEngineering)
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Would a 2nd graphics card be a solution? But as I said
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Hey all,
I wasn't able to fix this yet.
I did everything I can think of. I even tried to wire
one monitor with a VGA cable but it didn't help.
I even have small lags when I am moving the Safari window
between the 2 monitors. Really little lags then but they
definitely are noticeable. I can make a video of that
if that would help someone understanding.
Hope there is someone out there who can help me with this.
Thanks already for any advice!
Cheers,
Rick
Edit: Do you think a new graphics card like the ATI 4870 would
help it? But I really don't want to spend more money just to
have 2 monitors while i have already 2 dvi connections on the
ati 2600XT.
Message was edited by: RickUnique

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Hello
I hope you have checked Users manuals delivered with your unit. On the page 148 you can find very interesting table about supported display resolution.
I must be honest with you and say that I am not DVI expert because my LCD has no this port, just HDMI but if I am understood you right you have problem with 1440x900 resolution only. This resolution is not listed as supported and I presume it is not unusual that you have problem.
Sorry but I believe you must use maximum supported 1280x1024 resolution only.

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Hi RIF7000,
Thanks for using Apple Support Communities. This article has information on adding additional displays to your Mac:
OS X Mavericks: Connect multiple displays to your Mac
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Losing connection to 2nd monitor when iMac sleeps

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