Help please i just finished building a new pc AMD phenom2x3 720 gigabyte ma790x mobo saphire hd4850 1gb OCZ 2x2gb ram rosewill green 700w PSU my old HDD my old dvdrw ok I got everything together and it all powers up but no signal to my monitor.Gateway lcd. I have the monitor hooked up to the vid card at the crt connection . mobo light comes on, vidcard light comes on, cpu fan and case fans all turn on. HELP ME PLEASE!!!!