I am running a SY-KT400 Platinum with AMD 2100+ in a desktop case. How hot\ncan it get before it shuts off. I am running about 55 degrees C. 512Mb\nMemory, one hard drive, one SONY DVD RW, Radeon 7000 AGP, modem. About once\na week, the machine shuts down with one long loud beep that does not shut\noff until it is turned on again. Is this a heat problem or something else?\nAnybody know?