No Boot when Second Channel Installed

[JAM_N1]

Hello Everbody,
I just recieved some Mushkin 2GB XP 4000 Redline (2x1GB), I can run both sticks through Memtest stable in single channel, 1 or 2, but when I try to install second stick in second channel, 3 or 4, the board freezes on bootup with 3 lights. I have tried both the yellow and orange slots with the same result. I can put my G.Skills back in using both channels, orange, and the board fires up. Anybody know why the XP 4000 won't boot up when running both channels? I have dropped the clock in my sig to 250x12. Any help would be greatly appreciated for I am stumped. :shrug:

[JAM_N1]

Well it looks like I won't find out why it never booted up because it seems in moving the XP 4000 memory between the different slots, three of the contacts at the end on one side of one of the sticks have come off and now I cannot even run my G.Skill in duel channel (orange or yellow). I have another board, so I will try that and give Mushkin a call. :bang head