Macbook pro, restarts itself?

I am having the same problem, and when you Google this issue you'll find a ton of people posting about the same issue. However, I have YET to see a response or resolution to it.

I asked for a new Mac Book Pro at work because my other one was doing this and I thought it was a fluke. Now I have a brand spanking new one, and the same thing is happening. The only difference is that my "old" one would restart while I was working on it. This one restarts when it is left untouched for a long period of time (overnight, or even a few hours).

Does anyone know what is causing this and how to resolve it?

I'm having this same problem and would be thrilled to find a solution!

I have has the exact same problem as everyone else who has posted here. Nothing in Console, not application or network related. Basically. nothing to go on at all as to why it was happening.

I think i may have found the cause however.

My problem pretty much began when i not only upgraded to 10.5 but when i also upped my RAM to the 3GB max. As nobody on this thread has posted what there RAM config is with their machine, i'm not sure where you guys stand but things for me got progressively worse after these two aspects were installed on my machine.

I have now taken out the (what i think) was the original 1GB chip and just left in the single 2GB. My macbook pro has now been running continuously for 3 days and i have experienced zero restarts, hangs when waking up or any kind of performance issues at all. All RAM is Kingston incidentally, no unbranded nonsense.

I strongly recommend you guys testing out your RAM using Rember, its a great little app - http://www.versiontracker.com/dyn/moreinfo/macosx/24508
This could be the cause of a lot your problems, especially when you upgraded to Leopard and changed you RAM configuration.

I think i will leave this running non-stop for a week or so just fully put my mind to rest but so far its looking good. I just hope she doesn't pop any time soon!

Anyway, i hope my findings have proved helpful for some and if not at least another angle to investigate for others experiencing the same incredibly annoying fault.

Message was edited by: j.tec

Well, I just tried to do what you suggested and downloaded and tested Rember, and it said everything was fine. Of course, I haven't added any RAM recently, so I wouldn't have thought that to be the problem. But these random, sudden restarts are driving me crazy. If anyone has any suggestions, I'd be much obliged.

I have the same problem with my Macbook. Haven't been able to find a solution yet.

Though I can't be certain it's what's plaguing you, try this:

System Preferences --> Security --> Log Out after __ minutes of inactivity

Make sure that option is unchecked, or increase the time (I think the default is 15 minutes) if you want it to log out after a particular duration. I keep mine unchecked.