4 sticks draw more power from your mb. You're better off using 2 2gigs then 4 1gig sticks, but since you already have them. Put one pair in and then go into your bios. Manually set your ram's voltage to the manufacture spec's. Save turn off & install the other pair. If you still have issues, increase the voltage by .1. then try .2, no more then .3 volts.