Dell inspirion 2-N-1 plugged in but not charging

Have a 2-n1 that I purchased a year ago key came off got brother ( major in IT)  to replace the key. After a hour of him taking the back off key was not fixed, instead computer is plugged in but not charging  in addition to touch screen not working and system is still very sluggish. Contacted Dell the tech's reply was that motherboard had stopped working. Tech never did a remote diagnostic on the laptop either. We tried to restore default settings. Ideas on problem please.