The last few mornings when I boot the PC, I hear a "clicking" sound, and only lasts a few seconds. This morning it was just a couple of clicks, yesterday five or six. During the rest of it's run time all seems fine no abnormal slow downs, etc. I can't tell if it is one of the hard drives (2- Western Digital 250G SATA-2) or the big fan that is mounted right in front of the drives (Ultra Tower case). The "clicking" is not as pronounced as the "click of death" associated with the old Iomega Zip drives, nor lasts long enough to pin point it's source. (Non RAID config any longer, just separate drives). (I've used PC's as a tool since 1984, but not really heavy into the tech end). Custom build, WinXP. Ideas? Thank you for any feedback.