mobile

Hi
I bought a cheap motherboard the other day to try fix a old HTC one x I had thought I would give it to one of the kids. It installed ok and the phone booted up great but it can't find any mobile network at all if I put a SIM in it says preparing SIM but that it. If I go to setting and try to search for any network it just comes up with a error message. Also noticed the motherboard as been rooted and installed a Rom called Venom