3130cn Paper Jam

I have had my 3130cn for 3 years and have hardly ever had a paper jam. It has been the best printer I have ever had.

I replaced my yellow toner cartridge this week (with a genuine DELL toner cartridge bought from Amazon), and immediately I started getting constant paper jams.

When the jam occurs, the paper does not emerge from the printer at all. It is hanging out of the bottom of the fuser. When removed, the part of the paper that went into the fuser is folded over once or twice and creased.

I have tried reseating the fuser, to no avail. The printer prints a couple of pages (if I am lucky) and then jams again.

I don't really see how opening the front of the machine and replacing the bottom toner cartridge could have done anything to the fuser mechanisms. These jams started immediately after replacing the toner cartridge, and before the first time I reseated the fuser.

Any suggestions?

Many thanks.

Richard