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You are here: MacNN Forums > Hardware - Troubleshooting and Discussion > Mac Notebooks > Keep having to reset PRAM due to grey screen

Keep having to reset PRAM due to grey screen
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JRobinson
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Join Date: Jul 2003
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Nov 15, 2012, 06:27 PM
 
I have a 2012 15-inch MacBook Pro (non-retina). I am running OS X 10.8.2. Every time the computer goes to sleep, it locks up and I can't revive it. In addition, when I reboot the computer, it stays at the grey screen with no Apple logo. In order to get past the grey screen I have to reset the PRAM.

I checked the hard drive using the Disk Utility and it says the hard drive is okay. What could be the problem?
     
ibook_steve
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Join Date: Oct 2001
Location: San Jose, CA
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Nov 16, 2012, 01:20 PM
 
Do you have any external devices drives attached? I have an issue that if I have an external drive attached at boot, I get stuck at a gray screen. Removing the drive and rebooting fixes it. I have no idea why the drive case (a ThermalX case) does this.

Steve
Celebrating 10 years and 4000 posts on MacNN!
     
JRobinson  (op)
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Join Date: Jul 2003
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Nov 24, 2012, 02:18 AM
 
It turns out the problem was an external device. Specifically, it was the USB 3.0 hub I bought. Too bad I can't return it.
     
   
 
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