black screen after login, Mountain Lion on Macbook Retina

Still have the Guest User account and didn't get any Black Screeen too.

I have had Guest user and gfxCardStatus both since I bought this 3 weeks ago too. From Lion to ML I didn't have any problem.

One day it just happened. I uninstalled gfxCardStatus and disabled the Guest and it worked. If anyone has this problem do one of these one by one to see if it helps or doesn't.

They may not be the problem (not that if you have them you will get a black screen) but they could be the cause of the problem in verity of situations.

No harm, if you have it just try this out. And report what happened with your case.

Thanks

I disabled the guest user now and see if it works. I dont have any Gfxcardstatus software installed.

I am using an iMac 2.8 GHz Intel Core 2 Duo, 4 GB 667 MHz DdR2 SDRAM. I get exactly the same black screen after logging in since I installed Mountain Lion.

I don't think it is exclusive to MacBooks.

Apple engineering called me to replace my MBPr for the black screen issue.

I got the new laptop home, everything seemed fine until I installed Windows via Boot Camp. I used windows on and off for a bit, the very next time I restarted and booted into OS X, I got the black screen after login again!!

I know apple is working on this, so I'm not too worried long term, but I'm on my 4th retina macbook now (several returns due to build quality issues, 1 because apple requested it) and it's getting pretty annoying. I basically can't reboot my $2,500 laptop! Kind of crazy really...

The other really big issue for me is the lag that I get when using Mountain Lion. In Windows 7, I have ZERO lag. Never, under any circumstance. In 10.8, the lag is everywhere! Swiping between fullscreen apps, zooming out into mission control/expose, scrolling in any app other than Safari is HORRIBLE, and just general sluggishness is really unacceptable to me for a $2500 machine.

I have two weeks to decide if I want to keep this laptop. I've bought a new mac every year for the past decade almost, and this could be the first time I've ever returned one! I hate to say it, but maybe I'll have to wait for the 2nd gen retina macbook 😟

Return of the Black Screen today... Just when I thought have resolved it.

Last try with the deleted Guest User Account. Will see...

I'm getting the same issue (have a new rMBP and Mt.Lion), it usually takes 2 or 3 reboots to correc the issue. I only notice it when I boot into windows 7 via boot camp and then boot back. It doesn't do it every time but I'd say over 50% of the time. I notice it less when just rebooting my computer and not using windows 7.

Are many of you guys using boot camp? Could that be a potential trigger?

Tried all current known fixes and nothign seems to work. Will continue to monitor this thread and hope for a fix.

Unfortunately, this just started for me as well on my rMBP. I'm not happy about this.

I believe it's the nVidia graphic drivers in ML.

Can somebody run this game in Safari 6 and tell me if it crashes your Mac? This one consistently crash my Mac and restarts my Mac to blank screen:

http://hexgl.bkcore.com

In addiiton, booting into the Recovery mode will fix the blank state for me.

Never used Bootcamp.

Well, after what seems like a lifetime of it not going to black screen, it did it again this morning.

Hadn't done anything differently, but here we go again.

Might try the boot into safemode thing again if it keeps happening.

Just thought I'd let everyone know that for some reason, it's come back!

Had the same problem. After resetting three times it finaly booted again. Disabled the guest account, and till now it's not occuring again,

In my case, it would start right from the boot process, specifically when I was running on battery. Went into the Energy Saver settings and disabled the Automatic Graphics Switching. I have not had the problem since. Again its worth noting that this problem only started after upgrading to ML.

Well I disabled Guest user and uninstalled gfxCardStatus and it haven't happened since Aug 14.

I started this problem "black out after ***-in" on the day I installed Mountain Lion, which was persistent after clean install two times.

After seeing an earlier post of this thread, I disabled "Automatic graphics switching" (the top tick box at System Preferences/Energy Saver) and it completely eliminate the problem. Please make sure you disable this for both battery and power prug settings.

For sure, enabling auto login and disabling automatic graphics switching will resolve the issue, but I just discovered that enabling FileVault has also cleared up the problem; can someone test this out too?

If so, this may be the best solution, as enabling auto login comprimises security and disabling automatic graphics switching ruins battery life..