That little microdust is really nasty, That's one reason I'm only doing water cooled systems now. The larger low speed fans don't seem to acumulate it much. Using compressed air, gently blow out the "junk" -- Feel the power of the dark side! Atmel AVR -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist