2011 13.3" MacBook Pro freezing during boot process I acquired a 13.3" MacBook Pro. The MacBook Pro turns on but freezes after approximately 30 seconds. I installed a good hard drive with Lion and the loading spinner simply stops spinning after it freezes. I also tried booting from a bootable flash drive but it also freezes. The boot media isn't compromised because I've used the hard drive and flash drive with different machines with success. I attempted resetting PRAM. The battery is brand new. I have also attempted verbose boot mode but it doesn't reveal anything abnormal.

Note: I have since allocated the hard drive to a different machine so I don't have a working hard drive available right now.

Though the bottom place indicates the model is 2010, verbose booting logged the CPU build date to be in 2011. Additionally, the interior hardware of the computer differs from 2010 models so I suspect the computer is a 2011 model.

What are your suggestions?
If you had the hard drive still in the Mac I would have had you boot the mac into recovery mode and reinstall MacOs. It wont delete any information since its only rebuilding the system files. 

You'll need to do the same when you get a working Hard Drive back into the Mac.