Within the last few days I have had 3 of make case fans make a constant clicking noise so I looked for any thing that may be causing such click but I couldn't find anything. So since I have had these fans for about 3 to 4 years now and my computer rarely gets shut down I'm wondering if this is a sign to replace them but here is the weird thing to add to this, if I leave my system up all of the time the clicking noise is really hard to hear but if I shut it down and when I go to turn it back on those fans make that noise for about 15 minutes along with giving me a warning that these fans are not spinning at normal operation which is right around 1600 RPM"s. The fans start right around 900RPM"s. With this being said I really don't have a problem leaving my PC running all of the time but I recently went up to an all in one liquid CPU cooler from Thermaltake and I'm afraid if I leave my system on all of the time I'm gonna hurt the pump or something. Also the brand of fans I have are the Thermaltake AF0032 120MM Blue LED. So does this click mean I about due for new fans or will mine make it a little while longer. Thanks.