Hi all. I purchased a MBP in 2009 (2.53 GHz Intel Core 2 Duo) to replace my old and non-functional MBP from 2007 (2.2 GHz Intel Core 2 Duo, OS X 10.4.11 currently). It was suffering from recurring Kernel panics, a faulty optical drive, and a broken screen; it had clearly seen better days. Well, due to this Nor'Easter we had this weekend, I decided to tear this thing open and get it working. I ended up resolving the recurring Kernel panics, and found an old external monitor to use for the time being. I also stumbled upon the OS X 10.5.4 install disc that came with my new MBP, so I figured I'd update the old laptop. Since the optical drive doesn't work, I used the Disk Utility with a new flash drive and did a "restore" on the flash drive with the OS X 10.5.4 install disc and the flash drive (with the correct formatting). When I plug the flash drive into the old MBP, I get the popup that asks to install OS X, and when I reboot with the flash drive in, it asks me to choose a language. The next thing that happens is I get the "OS X cannot be installed" error. Can anyone shed some light on this? I've verified and repaired the HDD but no errors were found. Thanks.