MacBook Pro 13" 2011 start requires disconnect battery, keyboard TRACKPAD NG

[jviews]

Got free non-working MacBook 13" 2011 vintage 8GB, I5 cpu.

Internal KEYBOARD and TRACKPAD DO NOT WORK. (even in diag mode)

Will not start unless i remove rear cover and DISCONNECT THE BATTERY, wait 10 seconds
RECONNECT BATTERY. Now it will start. (power adapter connected and green color indicator)

Unit 100% good mac, changed disk to SSD, and loaded High Sierra on it. works great
but again no trackpad or keyboard functionality and will not start once I do a SHUTDOWN or hold POWER to SHUTDOWN.

Been using USB MOUSE and USB keyboard.

Not software as I reloaded High Sierra clean erased ssd.

I "think" the keyboard is ok because I depress the power button to start the machine and it responds.

I have a spare new keyboard. I think it is not a keyboard issue but if you tell me to install the replacement, I will.

I cannot speculate on why I must disconnect the battery to START the machine.

Help appreciated.

oh yes tried resetting SMC AND PRAM several time.

oh yes first time I had to charge the battery for 6 hours. Battery is good and usable for 2+ hours, maybe longer.
i do not believe any of this is a battery issue.

 

[Aston441]

Is it a Macbook Air? If I were to guess, I'd guess some kind of cable attachment issue first. Gosh if you have a spare keyboard just put it in and see what happens lol.

Edit: if it is a Macbook Air, you're in the wrong forum. This is for Macbook, i.e., 12" macbooks, and I think the older white plastic macbooks. There's another section for the Air.

 

[jviews]

Still stuck. Will try spare keyboard today. Is macbookPro (not Air) 2011 silver aluminum case. Will update. Thanks for the thoughts.