7 Replies Latest reply: Feb 15, 2009 5:03 PM by Lorne Pike
baeksan Level 1 Level 1
A few days ago, my Core Duo 2.16 Macbook pro will not boot normally. It only allows me to boot in safe more. I've done hardware tests, and there seems to be no problem. I switched out the memory sticks with another macbook pro and still the same problem occurs. I boot into safe mode and reinstalled tiger thinking a fresh os installation would solve the problem, but still nothing! When booting up normally, there seems to be weird video glitches before the log in screen. Sometimes it will boot into normal mode, but the video will freeze up and I will have to manually shut down. In desperation I reapplied thermal paste to the logic board and heatsink, but the problem still persists.

Heres a picture of what it looks like:

Any ideas on what to do? I don't have apple care.


macbook pro 2.16ghz, Mac OS X (10.4.9)
  • Courcoul Level 6 Level 6
    If the system works ok, within its limitations, in Safe Mode, but goes crazy in normal mode, there's a good chance that it is a software-based problem. In other words, maybe something is getting loaded in normal mode that causes the problem.

    Try going into Accounts in System Preferences, select an admin account and look in the Login Items tab to see if there's anything there that seems odd or that you did not install. You can also try removing the items there to see if that resolves the problem; however, you may want to take note of what was there so you can restore the non-guilty items. Place the cursor on top of the name of each item and leave it there for a little while: a popup window will appear with the full path to where the executable is stored, which you will need to know in order to restore the item.

    You can also inspect the following folders to see if there's something unusual being loaded at startup:

  • baeksan Level 1 Level 1
    I dont know why anything weird would be installed because I did a fresh OS installation because I thought it was a software issue. So basically its a fresh clean install, so there shouldnt be anything weird with login items i hope, but I will try this out.
  • Lester Parks Level 1 Level 1
    Seem to be having exact same problem here with a user's machine. Have you found a solution for this?
  • Limor Shefer Level 1 Level 1
    *I have the identical issue!

    And I've done the identical steps in hopes to resolve it, but to no avail

    When I called AppleCare they said that if I had tried doing a clean reinstall (level 7 of deleting all my original content) and that after the new OS is installed if I'm still having the same issue, I will have to take my computer in for hardware resolution.

    So, I'm about to lose days of work thanks to this and it's a new Mac Pro 8 core computer, arrrrrghhh!!!

    Please post if you find the culprit or an alternative solution -- Apple doesn't seem to be responding to this thread

  • John Wilson M.D. Level 1 Level 1
    Read your description and looked at the pictures. Doesn't look or sound easy. I think this is a hardware problem. Probably video card. Sorry. Please post back and let us know if you get it fixed.
    Just a few thoughts in the mean time.
    1. go back to Tiger 10.4.5 or whatever your original, non-upgraded OS was and see if it occurs there. I know you said a fresh install but I'm not sure if you ran the update bundle or not.
    2. Try an external monitor and see if you get the same issues with it.
    3. Pull your ram cards one at a time and see if you might have a bad ram card.
    Oh, don't forget to check the crash log and see what it says.

    Hope you figure it out.
  • Limor Shefer Level 1 Level 1
    Good news is, Apple Care has finally resolved this issue (by a very large process of elimination) and has discovered that the issue was the Graphics Card. Once replaced, the computer was back to normal!

    Thanks Apple!
  • Lorne Pike Level 1 Level 1
    Hi Limor:

    The problem you were having sounds a lot like one that has been plaguing me, and your screenshot looks all too familiar. Just wondering if the replaced graphics card did indeed fix everything. Are you still trouble-free?

    Here's the thread with my issue:


    Any comments you can offer would be much appreciated. Thanks!