Printer has power, but won't print

JanShoes

Honorable
Aug 6, 2013
1
0
10,510
My HP printer (Officejet Pro 8500a) has power, but doesn't power up (screen is black.) I can't print and the message is "the computer is unable to establish 2 way communication with device". This all happened in the middle of an important job. Help, please!