My daughter asked me to replace the hard drive in her Macbook Pro 2,2 (mid-2007, Core2Duo 2.16Ghz, 2GB). She had been to the Genius Bar and they assured her it was bad, and the system would not boot. She had no backups. I installed the drive, but could not get SL to install. I took it to the Genius Bar, bit they had the same problem, regardless of installing from a disc, the network drive, or an external hard drive source. They said the hard drive I installed was too big. The original was 160GB 5400RPM, and it was replaced with a WD 500GB 7200RPM. Just for fun, I tried loading Leopard this weekend and it loaded without a hitch. With Leopard the computer works great and functionally is fine. However I want iCloud capability, so I was intending to upgrade to Lion. After getting Leopard up and running, I again tried to upgrade to SL, but every time I get a message, "unable to read the disc", after about 10 minutes. I have tried loading SL several times (with different discs), but always the same result. Any insight for next steps or any other ideas would be appreciated.