I have a 17" MBP (i5 latest model etc) and my dad has a 15" MBP (i5 latest model etc). I decided the 17" was just too big for my to cart around on tech calls etc so we were going to trade. I opened them both up and removed each hard drive. After putting his hard drive in the 17" it booted up just fine (slightly slow but it came up). I put my hard drive in the 15" and a flashing folder icon came up and it won't boot. I tried putting it in the 17" again and it had the same issue. I tried running disk utility from the DVD and that was alright, but when I tried to repair the disk it found a couple errors but could not complete the repair. Any thoughts or suggestions??