mbp sudden shutdown

[composer66]

I have a MBP 2.16 c2d. When I take the power adapter off, my mac suddenly shuts down. If I try to restart on battery power, the light at the front lights up, then it makes a strange sound and shutsdown. All within about one second. If I plug it back in, it works fine, but shuts down as soon as I take the apadter out. Any help would be appreciated. I do have applecare but would prefer to find a solution. Thanks

 

[webgoat]

I have a MBP 2.16 c2d. When I take the power adapter off, my mac suddenly shuts down. If I try to restart on battery power, the light at the front lights up, then it makes a strange sound and shutsdown. All within about one second. If I plug it back in, it works fine, but shuts down as soon as I take the apadter out. Any help would be appreciated. I do have applecare but would prefer to find a solution. Thanks

https://forums.macrumors.com/threads/355369/

 

[composer66]

I just tried an smc reset. Still having the same problem.

 

[composer66]

I just tried again but without my external monitor plugged in. Everything works fine. Is it because the battery is not powerful enough to run two monitors? I am pretty sure it was working before?????

 

[composer66]

Now I just plugged in my external monitor while running on battery, and everything works. Weird.

 

[lavrishevo]

This may be stupid but do you have "automatically restart after power failure" turned on under the energy saver/options settings?

 

[composer66]

Never thought to look at that but I just did and it's turned off.