Digital BW, The Print

Tonight I was in the midst of a series of test prints for an exhibition 
when suddenly the paper feed of my Epson 2100 hampered: printer tries 
to load a sheet but is not capable of doing so. At first only A6 sheets 
didn't work, but now it doesn't work properly at all (a4 -A6, photo 
rag - standard thin printing paper). I tried to fiddle with it, but The 
printer is difficult to open, so I have no clue what happened. Any 
suggestions how to approach this?

Thanks in advance!

Joost