I installed a SSD into an early 2008, silver MacBook Pro, and almost immediately upon use I notice a feint humming that seems to be coming right from the centre of the keyboard, around the keys G, H. It's very low level, and you can only hear it when using the Mac in a very quiet room. It is easily heard when placing one's ear close to the keyboard. The noise starts up immediately upon starting the Mac, and is not something that progressively arises as the Mac gets hotter. iStat Menus tells me that the temperature is 47-53 degrees C. CPU's not overworking. I used this same SSD in a different Mac, and had not noticed this noise when used in the other Mac. I also hadn't noticed this noise in this present 2008 Mac when it had the original HHD hard disk. So the noise, as far as I can tell, pretty much started when I put the SSD in. Other than that, the Mac seems to be working fine. Any ideas?