Paper Jam in a Lexmark x7675?

I have a Lexmark x7675. Worked fantastic for a year then all of a sudden when I try to print/copy etc the paper gets 'pulled down' on the right hand side and just 'jams'.
This problem happened overnight without any warning etc.
Have contacted Lexmark and went through all thier obvious palava about obstructions etc but no difference.
Everything looks just fine and all sounds just as normal apart from the 'jamming'. It's a cracking printer and do not want to discard it as I am a full-time home carer for my son and do not have the money but desperately need help with this problem.
Can anybody help pleeeeeeeese??