Siren sound on startup??

Hey guys, i just switched power supplies, (although i dont think this is the prob as it worked 3days ago) and a cpu fan . Anyway when i turned it on it sounded like a Police car, nee naw nee naw lol (siren) so i turned it off, wouldnt boot stuck at post screen, and unplugged everything, and put my old cpu fan back on, as i just changed it for a new one, and switched it on its fine? I guess i just want to know what that sound was, what does it mean. its a KT4 ultra....thx sasarchiver

This however unanswered question suggests it has to do with graphics card driver: Video BIOS?
http://forums.vnunet.com/thread.jsp?forum=6&thread=23363VBIOS
Flash_MMIO_MAP_DeviceIoControl Error
From this idea, I went searching and it seems as if it actually is that way. Have ýou installed the graphics driver correctly, pref. while in SafeMode?
Addit: And have you installed the VIA 4in1 drivers?

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