I can't power the uno with a barrel connection power supply

I just bought a new Arduino UNO and I wanted to power it from a 5 or 12 volt mains power supply. But when I did that there was a puff of smoke from the arduino's barrel input connection. I tried another one and now there is no 12v or 5v supply to the arduino, only by usb.

Can it be repaired easily or is there more to it.

Unless you have the correct equipment and the expertise then time to move on.

Next time also check the polarity of the barrel before plugging in and try stay around or just below the 10 volt range.

Ok, thanks, and I guessed it was time to move on. I'll get a 9v power supply as well.