3 dead DIMM slots! ugh!

[SLyons]

So I had been running 2x 1gb sticks of ram in slots 1 and 3 of my asus p5n-e SLI mobo. I just bought 2 more matching sticks and put them in slots 2 and 4, filling them all. I booted the PC and now only DIMM slot 4 is working.

The system only boots with RAM in slot 4, every other slot fails with any one off the RAM chips.
When multiple DIMM slots are filled, the system boots but still only detects the 1 gig of RAM from the 4th slot

So basically the first 3 slots died. I tried flashing the BIOS, no luck. I've fiddled with many settings in the BIOS with no success.

Has this ever happened to anyone? Any suggestions?

[SLyons]

a shameless bump for help
I won't have 85 bucks to replace this mobo for a while, with the holidays coming up and all, i'm hoping someone has some sort of suggestion on how i could fix it...

[ElrichMeister]

i think your dimm slots are dead, how long ago did u get the mobo? u might be able to RMA

[jdrom17]

Tried increasing the RAM voltage to 2.1V?
And manually setting the timings so that the command rate is 2T?

650i is picky with memory so it could just be that...

[AKHandyman]

a shameless bump for help
I won't have 85 bucks to replace this mobo for a while, with the holidays coming up and all, i'm hoping someone has some sort of suggestion on how i could fix it...
Have you any other RAM available to try? Maybe the board is just being picky about that particular RAM. And as Jdrom suggested, have you tried adjusting your voltage? I don't remember ever hearing about 3 out of 4 DIMM slots going bad ... :(

[Zefram]

Tried increasing the RAM voltage to 2.1V?
And manually setting the timings so that the command rate is 2T?

650i is picky with memory so it could just be that...

JDROM is correct, Asus P5N-E SLi is very picky with the memory. And from what i can see the Vdroop spike on this motherboard is quite high, thus pump extra voltage into the memory (JDROM recommendation of 2.1V is safe - default 1.8V)