It appears that is a tantalum capacitor, which does imply you powered things wrong.
Time to buy a new board, maybe a genuine UNO REV3.
Do not recommend you try using it again as you might blow up something else.
Put it in the garbage can.
.
It appears that is a tantalum capacitor, which does imply you powered things wrong.
Time to buy a new board, maybe a genuine UNO REV3.
Do not recommend you try using it again as you might blow up something else.
Put it in the garbage can.
.