Hi All, I am new to this community and new to mac's in general. Background: I have a macbook late 2006 model. OS X, that was gifted to my by my brother, after the company that he works for gave him a laptop. I put a new battery in it about a week ago and am experiencing some problems with my computer. The battery charges sometime then at other times shows an "X" in the battery icon. Also when I am using the macbook on the battery only, it will randomly shutdown. Not go to sleep but shut down so I have to reboot it again. Does anyone know what might be going on here? I hate to say that it worked better on the old dying battery then it does on the new one. I did not have any of these problems till after I put the new battery in. Any help would be great, as I have no idea what is going on or what to do. Thanks is advance.