My printer goes through the motions but there is no print on the paper. I have replaced the ink.

Inkjet printers need to be used frequently to prevent ink drying out and blocking the print head nozzles.
If the print head cleaning maintenance routine does not clear the blockages, then print head needs replacing, but it may be expensive.
It may be more cost effective to buy a later model and better printer than replace the print head.

Replace your Ink Cartridges. Ink dries up fairly quickly, sometimes only lasting a few weeks if the printer is frequently unused.

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The Ink at the head of your Printer Cartridges has dried up.
Try this:

Load some plain paper in the printer

Remove the cartridges from the printer and carefully dab the print heads of the cartridges with a damp paper towel. ( when you start to see ink, the ink is starting to flow).

Replace the cartridges into the printer.

Go to:

Start
Control Panel
Printers
RIGHT click on this printer
choose Printing preferences
services
clean print cartridges 9some papers may print)
follow the instructions and do the heavier cleaning as well

Run the calibration function and allow the paper to print.

your print head is either clogged or damaged, A print head is the unit your ink cartriges sit in. If its a nedw or newer printer (under warranty) you can contact the manufacturer and they will send you a new print head at little to no cost-good luck

Your printer cartiage will be out of ink.

Or it will be dry cause of not used from long time.

Change the printer cartiage may fix this problem.

Thanks.

Exactly what I'm experiencing, it goes though all the motions, but no ink is on the paper. I just installed 10.5.8 last night on my Mac Pro. The drivers are up to date, but no ink hits the paper.

probably you just replaced th "ink" but what you really need to replace is the "PRINTHEADS"
Put new printheads and printer will print like new again.

Nothing at all? Poor you are. The pump may damage or lost electricity.

Replace the cartridges .. do an alignment page and a utility cleaning .. that should take care of it

the ink nozzles on the cartridges are clogged. first try cleaning them using a alcohol-soaked Q-tip against the shiny part where ink comes out (remove cartridges first). if still no ink, cartridges may be out of ink, so either replace or re-fill them.