"AC Power Adapter Not Determined" , and Power Adapter Won't Work

My computer recently displayed a "AC Power Adapter is not determined." message. I did not change anything, all I did was go to a friend's house and plug it in and it appeared there. Taking out battery and holding down power for 10 sec won't work. It appears everytime, and my battery is slowly being drained. Help!
 
sad I’m frustrated
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