My computer boots up ok but after minutes, or even hours sometimes, of\nrunning, the box starts to beep and a light flashes red/green on the front\nof the case. The light that flashes is labeled 'fan fan'. Does anyone here\nhave a clue as to what it is that I need to look at. There has got to be 6\nor so fans in this computer. I have removed and cleaned all of them. When\nthis problem first started, there was a forest of dust buildup inside\nespecially around the cpu fans.