P4P800E Deluxe and Gainward GeForce 6800LE problem

Hi!
I have just installed a new Gainward Ultra/2100LE GeForce 6800LE card on my
ASUS P4P800E Deluxe based PC and encountered a very annoying problem. The
card has an alarm buzzer for the card's additional power supply which goes
off as soon as I turn on the switch on the power supply unit and keeps
buzzing until pressing the ATX power switch to start the PC. While the PC is
running there are no problems and the VGA card works great. If I shut down
the PC the alarm goes off again and buzzes until I turn off the switch on
the PSU.
If I install the VGA card in my other PC with ASUS CUSL2 motherboard, there
are no alarms when the PC is turned off.
Has anyone had a similar problem and found a solution for it? Is there a
jumper setting to be changed on the motherboard or a BIOS setting that will
cure this?
All ideas are appreciated, thanks in advance

Mladen