I'm not sure what is going on with my Macbook Pro. A little background first. I just bought a used 2011 MBP model 8,3. It was working under Snow Leopard with the previous owners admin name and password. So I decided to do a clean install on the old HDD with Snow Leopard. Once I did that and restarted, the Apple screen would just stay on the screen and never boot up. This is with the stock hard drive. It was previously working before I tried wiping it clean. So I felt like I was wasting my time with that drive and decided to put my SSD in my MBP since I will be using this instead. So I inserted the Snow Leopard disc (I bought it off of craigslist, but it says retail version and looks like it). I tried to restart the MBP holding 'option' on startup and also on a different time tried holding 'C' on startup and neither worked. After this, since I have a 2nd MBP, I decided to use my 2nd MBP in firewire Target Disk mode. I then put the Snow Leopard disc in this 2nd MBP and installed Snow Leopard on 1st MBP via firewire (target disc mode). Once installed, my 2nd MBP showed that Snow Leopard installed on the 1st MBP hard drive (SSD). So I thought that looked good. I turned off the 2nd MBP and then turned off the 1st MBP. But when I restarted the 1st MBP, the Apple screen won't go away and just stays. I don't know what is going on. Anyone have any idea?