Chosen Solution
I ordered two RAM is 2GB, invoice # 276105 as of 08.02.11 I have a small concern. I can not turn on my mac after installing them. Why? I have a MacBook (13-inch Late 2006). In anticipation of a quick answer to my question, thank you in advance and you used to excuse me for my bad english expresion.
Try putting the old RAM back in and let us know if it starts.
First of all, thank you for your time away to take care of my little concerned. Now, with the old RAM so good. Some site offers to try a new and an old RAM, but whatever the configuration, there is no function, except, of course, with the old RAM. I wish I could install Mac OS X Lion, but I only have 1GB of RAM and it requires at least 2GB. What can I do? Again, thank you for the attention given to my problem.