BIOS shows only 2 DIMM slots as Active after re-boot

Info:
New Build w/Gigabyte GA-P55-UD4P - BIOS v. F3
8 GB of Corsair DDR3 (4x2GB) 1600
750 watt Corsair HX PSU
EVGA GTX 275
i7 860 CPU
2 x WD Caviar Black 1TB HDD
OCZ Vertez SSD - System Drive
Win7 64bit

On first boot (cold) BIOS shows all 4 DIMM slots as active and Win7 shows 8 GB or RAMM. After re-boot BIOS shows all 4 slots as occupied but only slots 1 and 2 as "active" w/total RAM @ 4 GB, windows reports 8 GB total and 4 GB as "usable"

Any thoughts would be appreciated.
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