Mavericks Second monitor not detected after wakeup from sleep

Hi everybody,
seems like my problem is getting worse after updating to the latest Mavericks (10.9.5), but the general problem came up with upgrading to Mavericks.
I have two monitors connectet to my 3,1 MacPro with ATI Radeon HD 2600 XT 256 MB, which worked without any problems for years (since SnowLeopard).
After upgrading to Mavericks the Mac started loosing the connection to the second monitor after waking up from sleep.
At first only sporadically and then coming up more often. Some Google search showed that I wasn't alone with this problem. When I first started to find a solution for this, some of the workarounds others recommended seemed to help like resetting the PRAM, choosing another resolution with pressed alt button etc. but over time nothing really solved the problem. I only had a chance to get back my second monitor whenever the problem ocurred. Today none of these procedures seem to help, so I give it a shot with this post...maybe someone has a real solution for this (or at least can confirm exactly the same problem so that I can rule out some other reason than a buggy Mavericks?!?).
What I can rule out from trying different setups:
- It is not a problem of monitor brand (no NEC, both same model Xerox brand) nor size (both same resolution and 22")
- it is not a problem of connections and cables (switching the pluging switches the problem to the other monitor)
-> which brings me to the idea that the problem occurs with just one of the graphic cards ports. But since I have no other card available I'd like to rule out software problems before buying new hardware!
- The problem comes up only when waking up from sleep (immediately trying to reboot after the problem has ocurred brings no solution, the secon monitor stays undetected). Shutting down the Mac and booting up after a while (no specific time, but at least a couple of minutes) brings up both monitors perfectly.
- The monitrs try to get through to the Mac: when switching off the undetected monitor manually and switching it on again, it displays: No signal, going to sleep
Hope there is some help around here...this is really getting annoying!
Yours,
Ray

The weird thing is that every morning, when I move my mouse to wake the computer, both displays go from black to show the desktop but the second display immediately goes back to black. Unplugging it and plugging it back in eventually works after multiple trys. Restarting the computer sometimes works but not always.
The only other major change to my computer before this started happening is that I installed Leopard.
So far I've tried setting my Macbook Pro not to go to sleep but that didn't change anything.
Should I try setting my displays not to go to sleep either? I haven't tried that because Energy Saver warned me that it could reduce the lifespan of the display.

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http://support.apple.com/kb/HT1573
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Hi Deason,
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Message Edited by Skurvy_Pirate on 09-22-2008 07:40 PM
Solved!
Go to Solution.

Well I got it working again but I'm not exactly sure how. I will go over what I went through so you guys can get an idea and possibly fix it. To start off I talked to MS support and I worked with them for a really long time. They tried intstalling different drivers (other then AuthenTec) and anytime we did that it would say "Fingerprint reader not available" at the login. They tried changing the power settings and which devices could wake up my computer and that had no effect either. I called Lenovo and they basically just told me to download the software that was already on the computer and change the option to have it wake up the computer, which doesn't exist. They were very unhelpful.
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Well I just bought my iMac few days ago, the Apple propaganda is all that their products are so much better and blablablabla, basically sales talk.
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