Battery Problems

[mainframe]

Sometimes when the battery icon shows that the power is decreasing I plug the AC Adapter in. However, even after I do this it doesn't switch to ac supply. I thought that the adapter might be unstable so I got a new one. However after plugging the new one in there was no change.
What could be causing this problem? Could it be a virus?
Thanks

[Laptop_wizard]

I had the exact same problem.
you kneed a new motherboard

[mainframe]

Thanks for the help

[beerak]

Check the power connector if it is rocky stable. No moves in any direction. Or take it into the service and try there another AC.

Check this http://forum.thinkpads.com/viewtopic.php?t=14370