Chosen Solution
I followed these instructions with a new iFixit battery for my early-2013 MBP. It was working fine (other than the battery not holding charge) when I started (it’s all backed up, that’s not the issue, I just want to be able to use this old friend). After reassembly, I connected magsafe to AC, and the machine immediately chimed. However, the screen remains completely black. Here’s what I know: on connection, the magsafe charging led is green, then turns orange; the CapsLock led is active; I can power down (no CapsLock led) and back on (chimes, CapsLock led working) with the power button; I’ve reset SMC and PRAM with the button + powercycle combinations; there’s no signal on the hdmi port (the monitor I connected to does not see a signal); I’ve disassembled and reinserted the display data cable twice (Step 29 in attached instructions). Does anyone have a suggestion about something I could try next? Thanks in advance – wylbur.
At this point I would re-connect your old battery to see if that altered things.
