Hello. Hope someone can help and hope that this is a good site to ask this question. Firstly I have a XPS 730 and have had it for three to four years now. Got it as soon as it came out. For some reason I am now experiencing a noise problem. Once I start the computer up I here the usual whine or hum of the fans, cpu, hard drive starting up. After the computer has been on for 20 seconds say, the fan at the front starts increasing volume of sound and/or speed. This fan is not the fan that keeps the PCI slots cool, its the fan at the bottom of the case. It keeps increasing until it's really loud and will last for say a minute. Then after a minute at top speed the noise / fan will then decrease speed and volume and keep decreasing until its normal volume. Then the process repeats. Ive opened up the tower and tried to ascertain where the sound is coming from. I have found that it comes from the fan next to the heat sinks and Air cooling system that cools the cpu. The air cooling system works by taking cool air and piping it over to the cpu (i think.) I felt the pipes after a couple of minutes and its seriously hot. Now I dont know if that is unusual or not. Basically do I need a new fan due to fan making funny noise or is this problem more complicated ie bios problems / system config?