I just put in a new GPU and PSU (GTX 750ti SC and Antec Basiq 550w) and my moniter says: no signal. My dvi-i cable is connected. When I turn on the PC the LED goes on and heatsink and GPU and case fan spins but no beep. Motherboard: AsRock A55M-HVS CPU: AMD A4-4000 (or A3-3000 don't remember). If you help, thank you so much! I can't sleep with this problem and I've been trying to figure it out. Thanks!