Duff Motherboard?

Hi there, i’ve just built a 2nd PC and like a fool i bought everything 2nd hand. No manuals, no warranty’s, no gaurantees etc etc Anyway i’ve just assembled it and turned it on and … Nada! Green light comes on the MB but no fans are spinning, no HD action, no Nothing! I know the PSU is working as i tried it in main PC. Motherboard is Asus A8V with 4 slots for memory and i have a 1gb Stick of ddr 3200?? ( Bear with me here as i’m reading most of this with poor sight and in a case with poor lighting!! ) I’ve heard of various issues from people relating to which slot memory goes in, maybe i need 2 sticks etc etc Also people have mentioned batteries for MB? Any ideas?? I’ve checked cables, thats about my limit i’m afraid!!