Some computers will not handle that much ram per slot. You may only be able to use two one gig sticks. For instance. My dell desktop has for slots and can handle a maximum of four gigs. 1 gig per slot. I can Use two gig sticks but the other slots must be empty. So my suggestions are:
1) take the ram back, get two 1 gig sticks.
2) try the motherboard manufacturer's site to se if a bios upgrade fixes the problem
of memory address.