I suspended Ubuntu on my laptop, and then carried it in my backpack to another place. Then I found that the laptop was off instead of being suspended. I couldn't make it power on either, even with power from wall electricity.
I then removed the battery and then put it back, and then I could power it on
So what was the problem?
Is my battery dead? How can I check its health under Ubuntu 12.04?
If it is because my battery was loose, then why couldn't I turn on the laptop with wall electricity?