Hi Reprap community

I lately bought the Reprap Prusa Mendel 3DP01 from Open heacent on dealextreme:
[www.dx.com]

I built everything together and pluged it in. The blue LED on the Melzi Ardentissimo 2.0 (mix between version 1 and 2) lights up and the fan spins.
But I can not connect to the Printer over Repetierhost. Do I have to do it differently?
I also wonder if I have to upload a bootloader or the sprinter firmware.How can I check if those are already installed?

Thank you for your replies

KatzeLeo