From the symptoms you are gettings there are two possibilities :
1. There is some paper or something jammed inside. Or the rollers have got misaligned due to previous jams.
2. The rollers have worned out with usage and need to be replaced.
Try to do this too :
Remove all ink cartridges. Turn off printer, then turn it upside down and shake it few times.
Then put it in right position, turn it on and see if you find some change
Open up the printer and blow air in it (using compressed air can) to remove all dust.
Try to rub the paper feed rollers with some rough moist cloth to increase its traction (grip).
If all this doesnt work than you can either send printer to manufacturer (which will be too expensive if its not in warranty) or to a local repair shop to get the rollers replaced.
Feel free to ask any question or concern you may have. I will be glad to help you.
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