I have a problem with a mid 2009 MacBook Pro (15 inch). It is running the latest version of ML. And has all original parts. No RAM or Harddrive was exchanged. With time it was booting slower and slower. At the moment it will boot in over 3 minutes. I havent seen that on any other MacBook I ever owned. So I decided to buy an SSD as I did for my brothers MacBook Pro 13 inch form 2009. But in the 15 inch I just cant get it to work. I tried a Samsung 830 128 GB first (same model that runs perfectly in my brothers MacBook Pro). First attempt with the Samsung 830 SSD the clean install of ML from a USB thumb drive always fails in the middle of the install process giving copy errors ("copier error 22"). Second attempt with the Samsung SSD was using OS X Lion from a thumb drive. Same issues. Then I tried to go from the original Leopard Install DVDs that came with the MacBook. Exact same thing. I also tryed cloning the Mac's disk to the SSD. I could boot OS X but it was crashing all the time. Freezing the OS and so on. I checked the SSD using Diskutility multiple times. No issues detected. And it even runs fine within my Windows Desktop system atm. Second SSD I tried was a OCZ Vertex 2 128 GB. I tried all the steps like I did with the Samsung SSD. Again no luck to make a clean install of OS X. What is it that I am missing? The same SSDs and clean install worked flawless on my brothers MacBook form 2009 and also on my MacBook Pro 15 inch from 2010. Any suggestions why on earth the 15 inch from 2009 wont work?