that is strange. has to be something affecting the cpu fan header (assuming that is where you are plugging in). try using an adapter and plugging into a molex connector, bypass that header
I'll Try it.
I would say your fan is going out you should replace it ASAP
You really think so? Every thing I Boot into XP I would hear beeping sound because I turned the CPU fan fail warning in the BIOS, it could be telling me that the fan is about go out?