For the last few days I have had some serious problems with my mac. I will be in the middle of doing something then the screen will change to dark and all function will be lost. It says "Your computer needs to re start. Hold down the power button for a few secnds or press restart." It comes up in a few languages as well. I havn't installed anything new on the computer but about a week and a half ago I got a new internet connection. I was using free wireless before, but my roommate and I decided to get our own line. I don't know if this is part of the problem but I doubt it. Now its so bad, I turn my computer on and within seconds this shutdown prompt comes on. I'm currently using my friends comp to write this. Does anyone know what may be happening and how do I fix this? Is there a recent virus that could be affecting the computer? Thanks for all your help!