I was experiencing a number of problems which I ended up putting down to my ASUS 8N-SLI. These were:
1. Long-running problem with my RAM, in that my Crucial Ballistix had never been happy, and things had progressed so that the board was saying its default was 3-3-3-12 2T, and was not happy at running 1T. Running with 1 stick made no difference. I've tried the sticks in my old NF7-S v2 and they are recognised correctly and happy to run at 4/3 (i.e. around 220) at their default timings (important - see later).
2. Suddenly my Audigy 2 card would not work in the PCI slots. Other PCI cards run OK (but of course Creative cards are notoriously fussy).
3. Also suddenly my Optical drives didn't like IDE0, although they were happy to run on IDE1.
4. I got a number of crashes and then BSODs.
Monday I sent the mobo back to Scan (plus CPU, but this appears innocent?). Tuesday I get EMail saying NFF, please send payment. But when I go on the Scan site it says that the Memory was running at 216 when the FSB was set to default 200.
OK guys, I know what I think, but I'd appreciate hearing what you think the problem is and what you think Scan should do.