All the lights on my HP C4795 keep flashing and I can't print

Hi,

I will suggest you try reset the printer, follow the instruction below to reset your printer, if the problem still persist, replace the cable that connects the printer to the power outlet. If that did not still fix the problem, you will need to reinstall the driver of the printer, you can get it at HP web site.

1. Without turning the unit off, unplug the power cord from the back of the product.
2. Press and hold # and 6 keys.
3. While holding those keys plug the power cord back in.
4. Wait until the screen goes blank before you release those keys.
5. Follow on printer screen instructions.

If that did not fix the problem, try this,

1. Unplug the power cable from printer while the printer is powered on.
2. Press and hold OK and HELP buttons while plugging in the power cord. Wait for the screen to go black or blank before releasing the keys.
3. Just turn on the printer and configure your printer new..