Hi everyone! I have MacBook A1181 2007 model with Intel Core 2 duo 2,2Ghz processor, 1Gb ram and so on... Today i bought 2x2Gb Kingston DDR2 SO-DIMM 667Mhz ram. After i installed it MacBook turns on but it dosen't show nothing. If i put 2Gb and 512mb ram (2,5Gb) it works fine. Where is the problem?