I moved a KT3 Ultra motherboard + AMD Althon XP 1900 to an older ATM case+300W PS. There are always beeps when shutting down the machine. After the screen goes black, power is still on and I begin to hear long beeps. I have to turn off the switch at power supply to make it go away; pressing the power button for several seconds can shut down the machine, but beeps come back when turning back on by power button.