I installed Windows 98 on my brand new computer. When I try to shut down, the power does not shut down. Windows 98 does, but the case light is still on and the power is up. I have a black screen but I have to shut down the power by manually turning off the switch in the back of my case. If I try to shut down the power by pressing the power button in front of the case, it does not work. What "makes" the power shut down. Is it a setting in the BIOS? or is it Windows 98 ?