Hello, I've upgraded my macbook 2.2 (SR) today with 4GB Kingstom RAM (2x2GB). I thought everything was OK since there were no visible issues and the RAM was properly recognized. But after a while i noticed an 'electric buzz'. This 'buzz' starts from the moment I power the macbook on and stays at a constant level untill I shut down the macbook. Another weird thing is that when I put the original apple ram back in, the buzzing stays. (I'm 100% sure that the buzz wasn't there when before I putted the RAM inside, no doubt about that.) Some additional things: - PRAM & SMC reset didn't resolve the problem - fan is running at 1796rpm - RAM is the correct type and doesn't crash the system - did the upgrade myself Can somebody help me with this problem because I'm very annoyed with it!