For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
So it let me install MacOS but when I tried to open an app it locks up and restarts. Not sure if this is a bad CPU or what. I do not know the history of this computer but the case does not look like it has been dropped or anything.
Test if you can run Windows, or Linux normally.
Also test OSX disconnecting LIO flex and trackpad.
Use USB mouse/keyboard connected through a hub on the MLB port.
Test the machine without battery too.
Also perform PRAM reset 2-3 times...