Computer assistance needed urgently, please

mkay.. so charger wire has loose wiring showing and if the black wire touches the red wire the computer completely shuts off, and when you turn it back on you have to go through the whole re-start process and lose unsaved documents. Plus when you run it in the normal mode it takes forever to load anything, and a little window keeps popping up saying "microsoft windows is not responding." but when I run it in safe mode, it works fine. what's wrong here?

My theory is that the charget has been short cerciting (i know i spelled it wrong, forgive me) so much that it's been causing damage to the motherboard, but yet why does the computer work fine in safe mood then? I need a lot of help.

Thank you!