whats going on everybody?

this is my problem i just took my boys nitro rs4 off his hands cause it was just sitting there collecting dust.. so i had the lhs clean it up for me and change some broken dogbones in the rear.. they test ran it for me but i was not there, they said everything was fine.. so know today i'm was gonna turn it on but i was check to make sure the radio control was controling the wheels but i get nothing. my question is, do you think it might be my crystals that are messed up? thanks........