I have a GA-P55-UD4P board with a core i5-655K.
When I use both white slots (1 & 3), the PHASE LED all light up. GREEN, GREEN, ORANGE, RED. and continue to cycle, forever, then corrupt BIOS, However only restores it back to F3, from F10 with only one stick in.
If I use a white and a blue slot (3 & 4), it boots fine in Single channel mode.
I have two sets of RAM, which happens on both.
Bad board or CPU?