Free and simple com1/rs232 monitor ?

I have to run, teaching a class. For us to help, we're going to need a lot more info. If you damaged something internal, it is doubtful you could repair it yourself. Everything is surface mount and generally pretty condensed. Without schematics and access to the same parts the manufacturer had ...
Your best bet will be to take it to a computer repair shop, see if they can confirm the hardware is damaged, and if so have them quote making repairs.
Will be back in ~6-7 hours...