Chosen Solution
So i know that this Macbook does not support Catalina but I went ahead and install it. The installation had several glitches with the circle and cross but it did made it to the desktop. Got online without any issues. I did not used the computer all weekend but when i turned on the computer, it did turned on but it stop charging then it completely shuts off then i will not turn back on nor charge at all. Can this be related to Catalina, what could have happened? Is there a way to turn back on and install back High Sierra? Please assist, thanks! MacBook Pro 13.3" - Mid 2012 Model #:A1278
Lets check and clean the MagSage connections. Follow this Apple T/N Apple Portables: Troubleshooting MagSafe adapters Are yours clean? Here’s an example of a failed connector
If you looks damaged or can’t get it clean you’ll need a new MacBook Pro Unibody 13" and 15" MagSafe DC-In Board and here’s the guide to put it in MacBook Pro 13" Unibody Mid 2012 MagSafe DC-In Board Replacement
