Start by turning off both your printer and computer completely (after saving the AbiWord file first, of course!).
Then turn them back on and try printing something from a different program (to see whether there's a problem with the way that AbiWord communicates with your printer). For example, simply type a few words in Notepad and see if you can print it out. (To access Notepad, go to Start > All Programs > Accessories > Notepad).
If that works, try printing from AbiWord again. If it doesn't, try cleaning the print heads (even though you appear to be able to get a 'block of ink' to print).
If you continue experiencing problems you might need to reinstall the driver for your printer. (To do that you'll either need the disk which came with your printer or, if you tell us the exact model of your printer, we can hep you find the driver file online).