On start up won't go past white screen have done a hardware test with the error 4b1104
Google the error code.
SOURCE: Error code when running Apple Hardware Test
Its an issue with the hard drive in the lower slot. The volume may be
corrupt of the drive could be physically damaged. Did you install the
bottom drive? is it the drive with the OS installed?
What does SMART statues report in DISK UTILITY?
Hard Drive/Application/Utilities/Disk Utility
Let me know.
SOURCE: DVD write problem and hardware test error code
I hope this works for you it did for me when I updated all my firmware.
http://docs.info.apple.com/article.html?artnum=88275
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