I switched from the bundled 1TB HDD to an SSD when i got the machine. I came to sell it last month and went to but the hard drive back in. I pulled off the internal DP connect So I ordered a new Logic Board Installed the logic board. Turned it on, gets to Apple logo and turns off (then reboots). Bootcamp boots and run fine. Is there something I'm missing or is it a faulty logic board?