6 Replies Latest reply: Jan 4, 2010 8:45 AM by Stotes
John Horton1 Level 1 Level 1 (5 points)
I saw another unanswered post on this, so thought I'd post my own question and see if anybody knows what's up.

Anytime I close the lid to my MacBook (black, Intel, running Leopard, purchased in 2008), the screen goes nearly dark -- it's actually an extremely dark grey, and I can barely see everything running normally. The only thing I can do is open and close the lid again several times, sometimes ten or more times, until it will finally not go dark.

The only slight clue I have is, it seems to do this when Safari is running but less or not at all if Safari is not running.

MacBook, Mac OS X (10.5.8)
  • gozman Level 1 Level 1 (0 points)
    I too have this problem and followed the suggestions of updating the firmware and zapping the PRAM. It had no impact on the condition. Mine is not as bad as the the other described yet but seems to be worsening so that tilting the screen toward the closed position when open will blacken the screen and pushing it forward towards open will make it flicker back on. (Open meaning about 135° from fully closed and toward closed is moving the screen closer to 90° or less.
  • matt.dudek Level 1 Level 1 (10 points)
    I've got the same problem. It seems like there is a loose cord or something in the hinge. between the monitor and somewhere in the main computer. Or maybe it's a loose cord/contact with the backlight because the screen still "works," I can see the 'log in' screen as if it were on 0% brightness.

    Is this a "known" issue? Can I take this in to the apple store to be repaired, or am I out of warranty?

    P.S. - I don't have any problems when my computer is hooked up to an external monitor.
  • gozman Level 1 Level 1 (0 points)
    I looked a little closer in bright light and it is the Backlight that is going out; I can still make out the images on the screen which makes(at least mine) look like it is with the Backlight on the LCD panel (or power to it) that is where the problem lies.
  • Stotes Level 1 Level 1 (0 points)
    I've had the same problem for a couple of months and I just got around researching it. It seems like the problem is in the PMU- I believe it thinks the monitor is connected to an external screen when opening at a certain angle.

    I followed the 2 links in this thread, resetting the PRAM and the SMC, but that didn't work. What DID work, however was resetting the PMU. My monitor now opens fine- no weird black tinted screen!

    Follow the instructions on this link: http://support.apple.com/kb/HT1431?viewlocale=en_US
    For my model of MacBook, all it took was shutting down, holding down Control, Option, Command and the Power button all at once, until the computer starts up and makes a really loud beep, and voila, the monitor is functioning normally again!

    I hope this helps- It certainly is nice not to have to jiggle my screen for 5 minutes everytime I open my screen from sleep.
  • Stotes Level 1 Level 1 (0 points)
    I posted too soon! The problem is still occuring- I'm not sure if resetting the PMU etc. was a temporary fix, but the monitor still goes to nearly fully black when opening from sleep. Very frustrating!