Hi, our first tr8620 stopped feeding paper from the bottom and Canon replaced it. after about 2 months this new printer suddenly stopped printing. the computer sees the printer and says it has started printing but nothing happens. this happens if I try to print from Word or the internet. The funny thing is that if I try something like print head alignment, it prints fine. I have reinstalled all the softward and drivers but nothing has helped. can someone please help me, thanks.