Screen black after mountain lion install

After install, the screen connected to the original video card is black, other 2 screens connected to evga gtx 285 are ok. do i need a new video card?

I have the same problem over here!
I installed the ML and after that, my BRAND NEW MacBook Pro with Retina Display rebooted.
The only problem is that the display is black! I tried to reboot a few times holding the power button with no success, only to have an idea. I connected an HDMI cable to my TV and I could see the login screen and work nice.
But c'mon, i bought a laptop to take it wherever i want. Now I can only get the image on my TV with the HDMI cable.
Does anyone knows how to put the image back on the screen? I tried everything from rebooting and taking out the HDMI cable to searching on the Settings>Monitors for something..
Thank you in advance for any answer.

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Problem with mail after mountain lion install

Mail has become sluggish to locking up after Mountain Lion install. I get the color wheel each time I start typing in an address to send an email. I also get the wheel when i am typing an address or name in any web page in Safari. Is this a Mail Problem or an Address Book problem?

It sounds like your computer needs to be cleaned up. Have your repaired permissions or cleared caches since you got the computer. Often times when upgrading operating systems permissions get screwed up and it causes issues. Go to disk utility in your "other" folder in applications. Select disk utility, then on the left hand side choose Mac HD then click REPAIR permissions in the center section. Wait for it to finish, restart your computer, then test.

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http://support.apple.com/kb/HT3964?viewlocale=en_US

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Hi There,
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After Mountain Lion install, my iMac powers off instead of just going to sleep. Help? Thanks.

After I installed Mountain Lion on my 2009 iMac, it will power off after I don't use it a while. It used to just go to sleep, I'd shake the mouse, and it would come back up. Now it powers off and I have to power it back up every time.
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Do these resets to clear errant commands:
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
The 5 second timing is important to a successful reset.
PRAM RESET
Zap the PRAM
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

Trackpad issues after mountain lion install

Since my Mountain Lion install, the trackpad on my 15" MBP will track, but won't select anything. Hot corners aren't working, the dock won't appear, etc. Anyone have any suggestions?

Got similar issues, no notifications and no switching between full screen apps (4fingerswipe). Some swipe features work, no secondary click in bottsom corners...Trackpad operational under Mountain Lion a total nuisance compared to Snow Leopard...PLease Apple, show some respect again to your faithfull customers and show some response!

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After installing Mountain Lion my Mac restarted and has been on the startup screen (apple logo with loading icon spinning) for the last hour... I'm assuming this means my hard drive crashed during the install? What ***** is this happened when I installed Lion the first time. Wasn't a cheap fix and lost everything.

Similar if not the very same issue with my late 2009 iMac since upgrading to Mountain Lion.
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First time this happened I held down the power button until the system restarted.
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White screen after mountain lion install

Has anybody experienced this I do not know how to fix this ??

Similar if not the very same issue with my late 2009 iMac since upgrading to Mountain Lion.
First time I've seen actual script - DOS-like text (well, Linux or UNIX or whatever it is) that only seems to appear from a cold boot.
First time this happened I held down the power button until the system restarted.
Second time around - and from a cold boot - I entered "/exit" at the prompt and the system appears to have continuted the boot process.
Someone in another post added the following:
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...but from this I still coudn't see where the error lies. :/

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Oh. You are so in jail.
Plug the mini straight into the wall power supply.
You do have 4 - 8GB memory installed, right?
Disconnect everything but power and the display port to regular monitor connection. Make sure that external monitor is switched to the type of connection: DVI, HDMI, VGA. Wrong setting and your mini could be booted up sneering at you from behind a dark screen.
Boot mini.
Any change?

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http://imageshack.us/photo/my-images/515/screenshot20120814at332.png/
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Thunderbolt is not working after Mountain Lion installed

I'm putting this discussion again because the problem didn't solve like I thought !
As you can see from the title that I have a problem already after I installed the new OS X Mountain Lion. I got my thunderbolt to Hdmi adabtor connected to an LCD TV and it was working great with snow lepord. But after the I installed Mountain Lion. it won't even recognize that there is something connected and I don't see the options in my System Prefrences> Diplays like before.
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Well I would have hit repair. This might be stemming from a deeper issue with the installation. I've never seen that dialogue box before, and if ignoring it and booting normally worked for you then I say you did the right thing.
however
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Iphoto disconnected after mountain lion install

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you either need to run software update once more (there was a major update for a lot of iLife apps when ML came out for support with ML).
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try this:
system preferences - security and privacy - allow applicatons downloaded from: put a dot to anywhere.
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Premiere CS6 crashing on start up after Mountain Lion install.

Hi everyone, new to the forum. I'm on a mid-2010 Macbook Pro i5 8GB RAM using the Creative Cloud, mainly Premiere Pro CS6. So, last week installed Mountain Lion (probably a mistake) after I read that there were no issues with Premiere. Well, since then whenever I launch CS6 the purple Premiere art pops up and I get a spinning beach ball every single time and the app doesn't respond. Worked perfectly before ML install. I have called Adobe 3 times...no help. I have done clean installs, cleared preferences, tried on new admin users. No luck. I'm not super tech, if anyone has any words of wisdom, I would love that. Thank you all. Let me know if you need nore info on the issue.

Did this issue ever get resolved for you?

Screen black after mountain lion install

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