HP 2110 ALL IN ONE PRINTER

HOPE YOU CAN HELP!!! When I turn on the printer it goes through the set up sounds, cartridges go back and forth, but then starts to make a different sound and then goes in to sort of sputtering, ttttt, ttttt, ttttt noise. I have tried to take the machine apart and the sound is coming from under the button panel. I can't get to that spot to see what is there. After about a minute it stops, the green lights blink and the machine does nothing. If I press start, it sounds like it wants to copy, but then just says busy. When I lift the top I notice the light on and the part(looks like a bar) in front of the light, moves back (toward the button panel) in spurts too, and thats it. I have tried in the past to just keep shuting and restarting, and once in a while, if I'm lucky, it works, but most of the time it doesn't. The printer is about 4 years old, do I junk it or do you think it can be fixed??? HELP!!!