My TX100 always worked well until A4 sheet became stuck yesterday. Printer kept grinding around even though I switched off on/off switch, so switched off power. Later managed to pull paper out from inside and then the last from outside. However, the problem now is that when I try to print, although it appears to be printing (and tried scanning too) as normal, just a blank sheet comes out. There is ink in all cartridges. What do you suggest?