How can I fix my Epson DX8450 all-in-one printer?

So, I bought a second-hand printer and it doesn't work :(

When I turn on my epson DX8450 for the first time and select my language it tells me to "open the scanner unit and install cartridges"... so far so good.

I open the unit to see the cartridge holder moving slowly across the inside of the printer. However, it does not stop at the cartridge installation point but carries on to the far-right where it stops and makes a very loud noise at which point I am told:
"A printer error has occurred. Turn off the printer, then press on button to turn on. See your documentation"
... and that is all :(

Please please help!