Original post by: mayer ,
Your machine has a Serial ATA (1.5 Gb/s) BUS. The new drive is most likely a 3 Gb/s. See if it can be jumpered down. If there is a way for you to move your date back on your machine by 6 months, do it. I now get errors when trying to install Lion until I move the date back a year and then it installs with no problem.