This is my first post, might I add that I LOVE this site. I've resolved many of my macs issues from this site. Specs: Macbook Pro 13" (mid 2010) WD Scorpio Black 500 gb 7200 RPM Crucial 8gb memory Problem: Fan reads 0 rpm on istat menus, istat nano, fan control, and SMCfan control. My fan is certainly running, and my guess was that these applications weren't reading the fan bc macbooka only have one. But, here's the kicker, when I try to run Apple Hardware Test to see what comes up, my macbook shuts down within 5 - 10 min. of the test. This is what really has me worried, this must mean my macbook runs too hot during the AHT and that the fan's not doing its job. There's no apple store remotely close to where I live and I've upgraded the HDD and memory myself. Does it sound like I may need a new fan? Should istat and other apps pick up the fan sensor? I've been wanting to open it up and see but thought I should consult first as to what to look for. I also, most of the time, use an external cooling pad.