Hello
this issue is well known. 3 capacitors need to be changes. The total cost should be less than 5 dollars..
here is the link to the repair procedure. I did it and it works fine !!!
http://www.fixyourownprinter.com/forums/printer/59335
"Apparently some defective components were used in the construction of the logic board (see photo). On my C6180 there were 3 failed capacitors (the green cylinders - the puffed top indicates failure) and a 4th from the same manufacturer (TEAPO - many unfavorable web references to this manufacturer). I purchased 3x 330uF 16V and 1x 680uF 10v rated to 105 degrees Celsius (total about 60cents). On the logic board, the capacitors I replaced are labeled C613, C614, C660 and C662. If you are not comfortable replacing the parts yourself (or don't have a soldering tool), you will have to find someone who will. The time to repair should be less than 30 min - I did it in 25 min with only a solder pen. This also fixed the ink system failures the printer was having. A similar fix may apply to other printers produced by HP around this time. See image - http://www.fixya.com/uploads/Images/ACCA299.jpg
Disassembly is straight forward, all you need is a Torx T-9 screwdriver (I got mine from Home Depot, but you probably get them from lots of places). The only thing you need to remove is the cover over the logic board on the right end of the printer - you need to remove 3 screws (see images at this link http://picasaweb.google.com/109215435720772332144/C6180 ) - see pink circles. The logic board is held on with 5 T9 screws (these are different from the ones holding on the cover) - see pink circles. Lastly there are 11 wire connectors on the logic board. The ribbon cables pull out from their connectors, when re-assembling, push back in with care - some are rather stiff. When replacing the capacitors, don't install them backwards! The logic board is well labeled."