Chosen Solution
Hi guys, I recently changed my HDD to another one in order to sell the MacBook. After that it doesn’t turn on anymore. The only thing happening is that the white light turns on for a few seconds, then it goes off only to go on again. In this process the fan, the superdrive and the hdd make noises, so this isn’t the problem, i think. This happens repeatedly until I shut it off completely with holding the power button. I tried to rest the SMC, NVRAM an so on. Nothing helped. I also tried it without the HDD, with the old HDD also tried it without the RAM. Anyone knows the Problem? May it be the Logic board? I am a student, so I don’t have the money to replace it or even buyour a new Macbook. I hope someone can help me.
mmm … You got the correct drive for your system as your system has only a SATA II (3.0 Gb/s) interface, so that’s not your problem here. Lets disconnect the HD to see what happens. If the system starts up looking for a boot disk then I’m suspecting the HD SATA cable is having problems. Here is the IFIXIT guide to replace it: MacBook Pro 13" Unibody Early 2011 Hard Drive Cable Replacement and the cable you want is this one: MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable - Apple P/N 923-0104 If that doesn’t change anything then I’m suspecting one of the RAM modules is trouble here. Carefully remove the RAM and try the system without any RAM what do you see or hear? Update (08/06/2016) If the system does not respond with either test at all you have a bad logic board here. Sorry ;-{ When you opened the system up did you bang/drop something on the logic board? Did you use proper ESD precautions? Did you use a plastic tool to disconnect the battery? While the your system does have a GeForce 320M graphics chip it is not replaceable as its intergraded into the logic board so if that was the problem you’ll still end up needing a new logic board.
