[Jevangil]

In all honesty, if the memory worked fine then crashed, I would have to believe that you bought some faulty memory, or something killed them. I have seen the same thing happen on some PCs that I have worked on in the past. New memory that worked for a day or so, then the system would not start. With memory sticks, it doesn't take much over voltage, or rogue current to kill a stick. Even a slight touch of static electricity can fry a circuit board.

Another thing could be the differences in the timing settings of the RAM. That alone can cause severe instability issues.

Apple's memory can be expensive for what you get. The memory they use is also sold in various other places all over the net for a cheaper price. Just be sure the ram you are buying match up with the old memory in speed. If it is PC2 667MHz, buy the same.

My Macbook uses PC3 1066MHz RAM and when I went to Fry's electronics to upgrade, I found the right speed from a different manufacturer (Apple's 1GB sticks were from Hynix, I bought 2GB sticks from Patriot) and paid half of what Apple wanted for memory upgrade. No issues whatsoever with the new RAM.