Hello, my HP Office JET 4630 just won't power up. Before this problem occurred, I recall seeing error codes.
I found this this community and tried plugging the cord directly to an electrical wall outlet. I can hear a faint hissing sound, but nothing seems to power up. No information on the screen either. I unplugged, waited 60 seconds and nothing changed, same sound with no other indication of power going on. Could you help me to fix this problem?