I been working on a MacBook Pro mid-2012, 15” Retina display to wipe the iOS to switch to Linux Mint. First it needed a battery replacement. Completed that, fully collaborated, held a charge. I let it sit a while until ready to use again and put Linux on it. The battery seems to work because I hear and feel the hardware moving. Sometimes it feels fuzzy like static on top. Not sure if display went bad or keyboard isn’t responsive as some keys didn’t work even before replacing battery. I may check to see if any cables came disconnected. Any suggestions for getting the laptop to turn on?