Laptop goes off when plug/unplug AC cable

[sgb77]

Hi all. My problem here is the following: whenever I plug or unplug the AC cable in or out of my laptop it goes on hibernation, which is very annoying indeed. Sometimes I just want to plug it because I'm downloading something and my battery is running out.
I would like to add that when my laptop goes into hibernation, and I try to bring it back up nothing happens, only the fans go on, but no activity other than that, at which point I always just have to end up shutting the computer down cold and restarting it, which is getting to be a huge problem.
I have a Dell Vostro 1000 and running Karmic Koala

Any help will be greatly appreciated.

[waterhead]

Hibernation requires that the laptop to first save any open or temporary files to the hard disk. It then restores them when it awakens. I have not had much luck with this feature, and always disable it.

Check your settings for power management. Open this to check them:

System --> Preferences --> Power Management

[sgb77]

I looked to disable this feature in the power manager, but I can not see any option to disable it. The only possible choices for the option "When battery is critically low:" are Suspend, Hibernate, Shutdown. I have tried both Suspend and Hibernate with similar results.
So this is not a viable solution, thanks for the suggestion though.