Copies nothing but solid black paper

SOURCE: black line on my fax copies!

You sure can - the issue is that there is something on the thin strip of glass where the copy goes through from the feeder at the top - follow these directions and you should clear the problem right up.

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00671260&cc=us&lc=en&dlc=en&product=1119598&dlc=en&lang=en

SOURCE: Single black line down center of newly copied page when using Auto feeder to copy

I had this same problem but after while it went away - so my solution would be to just keep using it, and perhaps it will solve itself.

SOURCE: HP J5780 All in one printer

When i try to make a copy, it printing out just only whole page black color even ,I put color button.Why.

SOURCE: Lines print on copies when put through the scanner. But do not appear on copies when placed on the glass

You may also want to check if the ADF is dirty or contaminated with dust or hair. Here's a link with some information about how to clean the scanner:

http://support.lexmark.com:80/perl/support/support.cgi?relevance=1&ccs=229:1:0:111:0:0&mode=DOCS&doctype=KB&term=Scan%20Copy%20Quality&docid=ENUS32544

SOURCE: thick line when goes throught auto feeder

The automatic feeder passes the page over the scanner, the scanner does move, so even a small mark (often find it is correction fluid) will effect the whole page, check the glass on the left side of the scanner for any sort of mark