I don't know how swapping memory should have any effect on your RAID array unless somehow you managed to corrupt the CMOS. Try clearing the CMOS and re-setup your RAID array in the BIOS setup.
. Make sure AC power is completely OFF when changing memory or anything else on the mobo. If there is no power switch on the back of your PSU, use a power strip that can be switched off. As you want the ground to remain connected, just not the AC power.
.bh.