10.9.2 2nd monitor fix

I called apple today 3/3/14
I got a great guy.
MacPro 2.66 Nehalem 8 core
I updated 5 days ago from 10.9.1 to 10.9.2 as soon as it was complete my 23" apple display stopped working (this is my main display).
I use an acer 22" as a 2nd display this continued to work. My hunch was that it was the update.
I tried switching the 2 montiors (no good).
I hooked up a 17" viewsonic and after 3 restarts it worked.
I tried hooking up the 23" again no good.
Then I tried a boot drive with 10.8.5 and the 23" worked again.
So it was the update.
I called Apple today 3/3/14 and got a great senior tech he had me do a "SMC"
I worked!! got my 23" back.
How to do a "SMC"
1. shut down completely
2. unhook the DVI cabel
3. unplug the computer
4 hold the power button in for 30 seconds then wait 10 sec to plug everything back in.
Good luck everyone

just to make it clear here mate, unhook the DVI cable - you mean all of them of just the one now working??
unplug the computer - you mean unplug the power cable??
tks

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What could be the problem? The ATI 2600XT should definately
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in logic 9 ?!
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The problem/lags also occur when i sync the monitors.
Would a 2nd graphics card be a solution? But as I said
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Is it a hardware or software problem?
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I start to use both monitors (having application windows on both).
I've got minor lags when using only one display and leave the
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I tried:
-using only the 2x1 GB RAM which came with the mac pro
-using only the 2x2 GB Kingston RAM
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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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could be read >>Posting Guide<<
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Hello ITTech1,
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http://h30499.www3.hp.com/
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10.9.2 2nd monitor fix

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