I have an iMac “Core i7” 2.8 27-Inch (Late 2009) that I replaced the hard drive in. Before I replaced the hard drive it wouldn’t boot fully in. The hard drive tests showed that the drive had bad sectors.
When ever I used a memtest, ultimate boot CD, or any Linux CD it would boot but the screen would go black when the video driver was loaded. I thought nothing of it.
When I replaced the hard drive I put too much force on the LCD connector on the board and it bent up off the board a bit. Darn.
I was able to get Mac OS back on. The display works, but as soon as it boots in a bit the screen gets lines and freezes. The system has 4 ram chips, which I’ve tried all independently and running memtester from a Linux boot disc says the RAM is okay. Although I still can’t get anything but a black screen when I boot into Linux (I SSH in to the Linux livecd).
- The system always boots up to a black screen when using memtest, ultimate boot cd, and Linux live cds. But Mac installers work fine.
- The memory seems fine.
- It only freezes when booting into the installed MacOS.
- The hard drive is now new and installs fine.