Chosen Solution
Hy! My MacBook Pro (late 2011) won’t start up after SSD installation. Tried replacing with the old one, nothing happened. Pressing the power button has no effect (no lights, no fans spinning, no sounds) with any other key combination. Tried SMC reset and NVRAM reset, nothing happened. The only thing is working it is power cycle mode, but the MBP don’t boots up, only the apple logo appears and after 15-20 seconds it restarts itself. If I keep pressing Shift when trying to boot up in power cycle mode the MBP starts in safe mode so I can access data but battery is not recognized. I don’t know what to do anymore, I checked all the cables and all all the connections, they seems to be OK…
Sounds like you forgot something or damaged something Go back and check your connections What color is your MagSafe connector - Amber or Green? What does your battery checker on the side tell you how many lights are they blinking? Do you practice proper ESD protection?
Are you able to put in your old HD and Boot into it? Your Computer model is very notorious for having a bad GPU. Unfortunately there is not an easy fix for this without the use of Soldering or a replacement Motherboard. However, you would be running into the issue of the same problem happening again. Personally I would recommend looking into a replacement machine as the cost of repair for this computer vs. the value of it doesn’t make it worth the repair.
