[aedon]

well the first issue is that the rom might be the reason the charger isnt working.. so no need to worry yourself right off the bat.

in either case you would need to flash a different rom

you can try to just reflash the rom your on or any other

if that doesnt work then there might be an issue with the phone itself

at that point we can get back to your original question.

-1st
Download your original rom, you can probably get it on htc . com, if your phone recently went through an update to a different windows build like the touch pro did from 6.1 to 6.5 then it will be there for sure.

-2nd
Flash the rom, Im sure that by now you know how to flash so I wont go into detail.

-3rd
Find a 're-locker'
Im not sure exactly about the hd2 but i know that when the tp2 finnaly got unlocked, they also developed a 'relocker' for it.
Once you found that for your phone, run it, it will act like its flashing a rom, and what it will do is re encrypt the bootloader so that it looks like you never flashed anything

thats just about it