Now, I have a CPU fan that came with the machine I built at the end of March and is working perfectly (speeds up when under load, etc) and every now and then (completely random), the fan will squeak every so slightly for two seconds and then stop. I don't hear anything else, nor do I hear any grinding noises so I know the fan(s) is operational and working like it should. I can't tell if it's coming from the CPU cooler (after market, I refuse to use the crappy stock one Intel had), of from the tower's 200 mm ventilation fan located on top. Could it be that the fan speeds need to be adjusted manually in the BIOS settings to a different RPM? Or would it be better to have it kept to automatic so it can adjust the speed as necessary? It's annoying when it happens, but I've no way to reproduce the slight squeaking noise at will. The fans/fans can't be failing because I haven't even been using this for nine months yet. Could it be dust, RPM not set right?