Dell v725w "paper jam" error message

[disman00911]

Hello. Anyone familiar with Dell printers? I have a Dell v725w printer connected to my Vista computer. Until a few months ago, it was working properly. Everytime I start turning on my printer, I keep getting this message "Paper Jam. Press the ADF button and then lift the ADF door. Gently grasp the paper, and gently pull it out Close the the ADF until it until it clicks into place." However, there is no paper jam in my printer and I can actually print out paper, although for whatever reason I cannot print out black ink even though there is black cartridge inside my printer. Also, whenever I print out in color, the colors are washed out and the black ink is blank. Why do I keep getting this message regarding the printer startup and also about my ink situation? Thanks.

Here's the picture of my printer.
http://www.techhive.com/product/1193826/v725w-all-in-one-inkjet-printer.html