I had those exact same problems - to a tee. On the first instance, I had to completely re-install Vista 64bit. A week after that fresh OS install (and with no change in my OC settings that I've been using for weeks) it happened again. Luckily, I was able to just do the repair option on the Vista installation DVD and it worked again.
Now, my SATA drives just show up on boot whenever they want to. I don't even expect to see them anymore - if they're there, great - if not, it's typical. Luckily my P6T Deluxe will be here tomorrow and I can finally RMA both of these Extremes back to MWave.
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