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I just followed the guide for replace my MacBook Pro RAM from 4GB to 8GB (one chip), when I reconnected the battary it won’t work and my Mac won’t startup! The battary light indicator isn’t showing any light, when I connect to Magsafe to power source it lights in green but still not charging nor starting up. Can someone help me where did it go wrong and how to fix it?
The RAM upgrade probably had nothing to do with it. Most likely is that you unplugged the battery for the installation and failed to plug it back in. You might have bent a pin.
You be sure the firmware update is correctly. First you need do a PRAM with the machine connected to power. That is done with the folowing secuence : Command (cmd) + Option (alt) + P + R on a keyboard inmediatly after power on. Hear 3 beep, following hold off the keys, is the computer didnt startup , may be the damage is more deep and sugest go to a service center. PD try without battery.
