Hi,
After installing new Bios have you reset /cleared cmos to default settings,
Ensure your "USB Legacy support" or "USB Emulation" settings in your BIOS are set to "Enabled" or "On"
Are you connecting direct to the motherboard usb port?,
Drivers available here 32 or 64 bit
http://www.steelseries.com/downloadHave you tried to Uninstall and reinstall the ZEngine™ software (with the device plugged in prior to installation?,
Have you tried to boot with std ps2 k/board, then insert usb on stealth k/board?
Is it then recognised by O/S device manager?,
Cheers