My Problem
My computer gradually slowed down to the point where it would not boot. I could not format or repair the disk and a restore from my time machine failed to complete. I replaced the hard drive thinking that was the problem. Upon doing so I was unable to install the OS fresh on the new HD. It eventually got to the point where it could not even boot from the OS disk.
I got the very frustrating: "POSIX Error Cannot Allocate Memory" on the first replacement hard drive I ordered and returned the hard drive because I think it might have been defective.
My Fix
Reasonably well. Took me only 15 minutes but I was too impatient in pulling the IR sensor cable off the body of the mac and I destroyed it / wasn't able to reconnect it. The connection of the HD went very smoothly and my computer runs like a dream now.
My Advice
The IR sensor is a little tricky - go very slow and take a good hard look at how it fits together before you dismantle it.
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