When I try to print business cards on Avery cardstock, colors print but NOT BLACK!

SOURCE: Print Garbage

The reason your pictures come out dark and grey is that you have not set the paper thickness on your printer. On the back you will see a flip switch change this setting then feed your business card sheet in there and see the diffrence. Plus make sure your settings for your printer are set for a thicker paper this will fix your problem. Make sure though when done printing your cards that you set it back to the normal or you will have problems printing regular paper documents.

SOURCE: Problem printing business cards

in your program adjust the pic your printing to fit in yours sumtimes u have to adjust your print in preview box your card u made down or up whole thing so it fits in nice for u sumtimes they just dont line up right i had same issue just move your project up with it ok to make it print in box cards u need ok

SOURCE: Printing Business Cards on Cardstock

Yes, the roller system will only open wide enough for semi thick cardstock. If you read through you're manual you'll find the recommended card stock you can use. HP supports HP paper.
Here is a list of supported HP paper.
http://h10025.www1.hp.com/ewfrf/wc/prodTopCategory?product=16118&lc=en&cc=us&dlc=en&dest_page=product
See the user manual on page 45.
Papers to avoid when printing
It would not hurt to remove the rear door & clean the rollers. (No soap). Dried soap film will cause paper to stick to the rollers. You can go to Wallmart or a local hardware store & buy a bottle of Grease Lighting. This heavy duty cleaner (When dry), does not leave any soap film. Great for cleaning just about anything.
If you wish to download the user manual from HP (It's easer to see & find information faster. Just click on this link:
http://h10032.www1.hp.com/ctg/Manual/c00461378.pdf

Good Luck!
Mike

SOURCE: i cant print business cards on my hp c5280

Verify no pieces of the card paper are missing and try printing on plain paper to make sure. Then try new card paper and make sure none of the perforations are separated.

SOURCE: will not print evenly on cardstock business cards

This can be caused by the cardstock slipping to one side as it prints. Make sure when you print you are using the card stock settings found under your printer setup - paper type. Check to make sure that the paper you are usng is meant for your printer, most printers are meant for up to a certain pound of paper eg 120lbs. and going over this could mean that the paper is too heavy for your printer which causes the rollers to slip as it pulls the paper through your printer.