First - this discussion is WAY off topic ... you will see nothing further on it from me. If a fan makes noise at power up - replace it. If the fan is making any noise other than rushing air - at ANY time - replace it. A fan that is making noise has already "failed" and will not properly cool whatever it was designed to cool. If the fan is making noise it is not turning at full speed. Some fans will make noise and then stop altogether (and get quiet when they do). To find out which fan: 0) Power off - and maybe let it completely cool down if that is necessary. 1) Take the covers off the machine so you can access all the fans. 2) Turn on the power and stop all of the fans one at a time. Use something like a golf tee - NON CONDUCTIVE - and put it in the fan and stop it. If the noise goes away and then comes back when you remove the tee that's the one. For some fans you can just put your finger on the hub and stop the fan that way. You can also put something in the path of all of the fans before you power on and then remove them one at a time - you just have to have more golf tees. 3) Replace it and get on with life. If the noise occurs and stopping all of the fans one at a time doesn't stop the noise then you NEED to know what IS causing the noise. If the noise doesn't happen every time you power up - pay attention to when it does (system totally cold, only first time in the morning, etc.) and target that time and find out which one. Is this intermittent fan noise "super critical" ... maybe/maybe not. If it is the CPU fan your system will experience lock-ups and weird failures (never in the same program and no particular time) - and over time it could even damage the CPU and cause it to need to be replaced. If it is the power supply fan the PS WILL overheat and fail and when it does it will sometimes take the motherboard and/or hard drive with it! If it is a "case fan" then it is less critical - but still something I would fix if it were my computer. If it is anything except a case fan I would fix it right away. ================================== To Unsubscribe, set digest or vacation mode or view archives use the below link. http://thethin.net/winxplist.cfm