why is power cable not recognized by notebook?
This most likely isn't a windows 7 problem at all. It's more likely there would be some damage to the internals of your power cable at some place. Usually if there is, it's in the connecting end or the power conversion box. I would try a replacement cable first if you can. If you don't' have one, take it to a pc shop and see if they can use a test adaptor. If theirs works, it's the adaptor. If theirs doesn't, it's then more likely the power port on your pc is damaged.
