Siren sound...again

Opteron 244 in MSI K8D Master-F. See more specs in my signature below.
PC powers up, 5-10 seconds later the infamous siren sound (continuos high-low-high-low tones) starts.
NOTE: The PC boots just fine, Windows runs at it should... CPU temp is 45°C, chassis intrusion is disabled and cleared, BUT the MSI PC Alert util still states that the chassis is open, grrr..shouldn't matter, tho'.
IT's just that f**** annoying siren sound!!!
Flashed BIOS today (could be something here), got the sound afterwards. Cleared CMOS, loaded CMOS defaults, cleared logs, cleared intrusion, disabled intrusion.
Google'd around, checked MSI and AMD sites.
Found 4 explanations for this particular mobo beep code: (It's got an AMI BIOS)
1. Wrong RAM type
2. CPU overheating
3. Chassis intrusion
4. PSU problem
...but the damn thing have been working fine the last cpl' days, so how do I stop the "#¤#"¤ sound?
Read somewhere that it was possible to hear this sound if the mobo THOUGHT there was no system fans inside the case. Well, the only fan connected to the mobo, is the CPU fan. The 7 case fans are controlled and powered separately from the mobo. So, if this is the problem, how do I "tell" the mobo to shup up about it?
Update: System won't boot at all, now. No signal on screen. Only siren sound. Fans and all spins up, tho'. Had the same situation when trying to run the PC on other memory types. Now I'm stuck. Again.
Any ideas appreciated....

Hi all. Thanx for your ideas and efforts :-)
FYI, current status:
No beeping now; I upgraded the BIOS to the newest one, cleared CMOS, disabled what-could-be-disabled regarding system chassis & cpu temp monitoring, and put a jumper on the chassis intrusion pins on the mobo.
Didn't get the Audigy2ZS to work, but funnily enough, the Audigy 1 works as a dream!
Don't have any onboard sound, nor AGP slot; this is a "server" mobo and therefore, some wiseass decided that AGP wasn't necessary. No big deal for me, really, as I'm not a gamer, but AGP _would_ have been nice.
Have only got 2 PCI slots, the rest are PCIX. The Audigy2ZS is detected and you can hear crosstalk in the SPDIF connector when something is played, but that's pretty much it. Gone through all system settings with a couple of friends (one of which is an mcse and -should- have known what he was doing) - reinstalled, checked the device manager, multimedia settings, volume controls, pretty much the lot. Card works as a dream in another PC, tho'. Anyway, no big deal, I'll just use it in one of my other machines and stick to the Audigy 1 in this one for now.
I'll guess it's cased closed for now :-)
Thanx a mil'
KenM

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