Because, it just might be that the Hard Disk you are trying to reinstall on is bad! So, you should use the "Disk Utility" Program under the "Utilities…" menu in the installer to run the "Verify Disk" action on the internal Hard Disk of the MacBook Pro (aka MBP). Just this week I opened up a machine and it a) had a bad Hard Disk Drive, b) had a dirty/faulty Optical Disc Drive (aka Superdrive, dvd/cd drive, etc.) and that was possibly ejecting discs from a stuck trackpad clicker c) would not boot up from a USB Installer of OS X Lion until I removed the faulty Hard Disk Drive! So, if you took the install DVD from even the first release cycle of a Mid 2010 Mac Mini that had 10.6.3 on it, it still will not install on your machine. If you're not sure, when you boot up from the install USB check on the "About This Mac." menu item under the apple, or put in the machine you used to clone the drive and navigate to it and look at the read me files.Īlso, note that a DVD that came with another computer, unless it's the same model as yours, will not work to install. You cannot use the original release of the retail Snow Leopard install DVD as your computer probably does not support even a minor version of the OS older than it shipped with (which was 10.6.3).
I assume you didn't use the faulty DVD drive to do this?Īlso you need a retail version of Snow Leopard (barring the original install discs), if you have the packaging, then you could see if it has the green dot that says 10.6.3 on the front of the box. You managed to clone the version of Snow Leopard DVD that you have to a USB drive.
If you have an external DVD drive available to you then I would suggest running the Apple Hardware Test version 3A171 that came on the original install discs with that model. It sounds like you don't have the original install DVDs that came with the MBP (MacBook Pro). There is a huge list of things which can be wrong here:
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