HI guys, I'm new to the forum. I have just replaced my standard 1TB hard disk in my iMac mid-2010 version with a Crucial M4 SSD 256GB. I remember the original hard disk had 3 cables connect to it, but after replacing, only 2 connect to the new SSD, the third one I guess is the thermal or heat control that connect to the fan system maybe, Im not 100% sure ... Problem is now the iMac fan is running like crazy, maximum of is speed maybe, all day long if the iMac is on, sometimes I leave it running at night to download stuff and cant sleep because of the noise .... I tried to download SMCfancontrol but it shows 0C and 000rpm, I cant find my way around to fis this. And I dont even play games or anything that max out the iMac capacity, I only use it for movies, music, Word and other small stuff, never heard too much noise before with the original standard hard disk. Please help !!!!! cheers.