My Epson R230 printer runs off a com...

My Epson R230 printer runs off a computer with Windows XP home edition. This morning the printer worked. Now, with the sun over the yardarm, it does everything correctly but no ink is deposited on the paper. I.E., it runs its course over the paper, but there is no resulting image on the paper. None at all. The ink cartridges are far from empty, and everything is hooked up. I've run twenty sheets through this invisible printing, without a trace of ink. Any ideas PLEASE
- Tony, Bulleen, Australia