Printer is not printing, changed both ink carts, sounds like its printing paper comes out but its blank

If your printer cartridges are only ink tanks, (usually when print cartridges are cheaper than $30 each) i.e the print heads are separate, then you're looking at clogged print heads. In this case you'll need to run a Print Heads Cleanup procedure from your printer's control program. This option is usually in Maintenence or Printer Settings menu, depending on the brand and model of your printer.
If this doesn't help, then remove the print heads and use an alcohol-based or nail polish removing solvent mixed with some watter (50-50 mix would do just fine) and drip some of the mixture onto the location where you hook up the print cartridges. Usually there's either a hole or a permanent marker-type "finger" that goes into the ink tank that serves as a pipe to draw out ink from the tank onto the print heads. You should let the watter-based mixture to work its way through the nozzles, this should take about 15 minutes up to an hour, depending on how long the clog was there and the severity of the clog.
If this doesn't help then you may need to replace the print heads, which may not prove the best option since new inkjet printers are relatively cheap these days.