Hi all, I was right in the middle of doing something online and out of nowhere, the computer just went black and off!!! This has NEVER happened before and I'm worried. I recently installed a maintenance application called Main Menu. I'm now wondering if maybe I downloaded it from someone that has bad intentions, I hadn't realized at the time that I was not on a MAC site. I went to MacUpdate and saw it there. I read some of the comments below and noticed someone had written that they had to uninstall it because it froze the system twice. Should I do the same and reinstall thru the Mac site?? Also, remember, I keep saying how new I am to computers.... unfortunately, this means I have no clue regarding maintenance. I don't know what 'batch tasks' 'clear user cache' 'rebuild spotlight index' 'clean all logs' ANY of this means and what things I can click on for maintenance, without harming my computer-----HELP!!!!! ANOTHER issue, my AC (power) wire, the connection at the mag safe seems to be messed up, it has actually stopped working, as of last night. Does anyone have any suggestions as to where I can replace this or do I have to buy the entire wire, from outlet to computer (since it comes in 2 pieces??) I truly appreciate any help you can suggest before I end up pushing the wrong thins and ruin my computer!!!!!