Hello my name is***** can help you with your question...
In order to help you better on your problem with your Canon MG3100 I would like to know the following information:
- Did you purchase this printer recently (Usually the letter P error message is a sign of packaging residue still inside the printer.)
- Did you recently get a printer PAPER JAM? ( A Flashing Triangle usually means one of the sensors is being obstructed by a foreign object most possibly a piece of paper)