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#11
I have almost the exact set up. I was having problems with booting with one stick of memory in Slot 3-1. If it doesn't boot in slot 3-1 replace the motherboard. ANd thats what I did.
Now it boots with slot 3-1 plus it boots with all 3 sticks of memory.
It's still fussy the first time booting from a cold boot I see 4 GB. If I hold the power button, shutdown and then restart i see 6 GB.
For your problem I would make sure everything is reseated properly. Are you using bios version F5? If not replace either the motherboard, graphics card or maybe both.
Opps didn't notice you fixed it. sorry.