I have a Macbook Pro running leopard. My mac goes from gray apple screen to a blank black screen and stays there. I'm not sure what is going on. I have recently removed my boot camp partition as well as downloaded updates since the last time I have restarted so I'm not sure if that is conflicting. I tried booting in safe mode and nothing helps.
The next step would be to boot in "Target mode" and for that you will need a fire wire 400 cable and another Mac. Connect the MB Pro to the other (working) Mac and restart the MBP while holding the letter "T" on the keyboard, that will allow you to see the HD of the non-responsive MBP (orange color drive shown in Finder) from there you can do a premissions repair and see the HD. Most likely from what you describe, the issue is the HD in your MBP. I have fixed a few of those problems by running TechTools Pro via Target Mode. Hope that helps!
Try booting into single user mode by pressing Command+S while booting. You should then be at a prompt. Type in:
fsck -f
and press Return. Let it run and see if it corrects any filesystem issues, then reboot when it's done.
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My MacBook Pro 15inch goes into a really messed up screen when I turn it on. The 1/3 of the top screen is black and the rest is gray with some colors blended in. When I connect an external screen I manage to get up the login window and log in, but when I use my Leopard Instal DVD the MacBook won´t output a signal to the external screen.
Try inserting the os 10 leopard disk and holding down the c key while restartng. Use the disk utility to check for problems. If none found restart while holding down the option key and see if you get the leopard disc and mac os as choices.... you may have left some pc os files even though you erased the partition... worth a try...
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