Took my stock Apple 256ssd from my 09 15" MBP and installed into my new i7 15" MBP. When I power on I get the grey screen with the Apple logo and that's and far as it goes. I did the same recently with 13" MBP's and had no problems, the new machine started up fine, then I put the new install disk in and no problems. I can't get this far with the new 15". Any idea's. Thanks.