When I received my RMA board back from Asus two weeks ago, I thought I got a DOA board. It would not boot or POST. I tried three types of memory: Crucial Ballistix PC2-8500, OCZ Platinum Rev. 2.00 PC2-6400 and Kingston ValueRAM PC2-667. These are all 1GB sticks. I've tried it with just one stick, two sticks, and any combination. It would not boot nor POST. As a last resort, I decided to try my one Team Elite 512MB stick. And it booted! OMG...I almost called Asus again for another RMA. Once it booted fine, I went into the BIOS and changed VDIMM to 2.00V and Save it and all other memory would work flawlessly afterward but only if no clearing BIOS event occurs. Everytime this occurs, I have to put the 512MB back in, in order for the board to boot or POST again. The BIOS was an early one (don't remember which one, though). I flashed the board to 0809 and never had problem since (even clearing the BIOS). It seems like with the earlier BIOS, after clearing the BIOS, the VDIMM defaults to a lower voltage that higher performing memory can't work with. Whatever it is, I reflashed/downgraded back to 0311 just to tell out this theory and sure enough, after clearing the BIOS, it wouldn't boot again using the same memory that were having problem before. I put in the 512MB stick and boots right up with no problem. Reflashed back to 0809, no problem with any memory. I remember someone posting here last week sometime who was having a similar problem. Not sure if I read what he did to fix his problem. But different BIOS version seems to have a taste for certain vdimm voltage or something.
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