Power adapter Not supported on dell laptop?

I have a Dell 5100 laptop that needed a new power adapter as the original ones cables were breaking away.  I ordered a new adapter that's an original Dell power adapter for a Dell 5100 laptop but when i plugged it in and turn the laptop on i get the message:

'The power adapter attached to your system is not supported'

Does anybody know what's going on here?
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Mark DamenConnect With a Mentor ERP System ManagerCommented:
You have not been sent the correct part.  I would go back to the supplier, and quote this error message.  It is completely their responsibility to get this correct.
kreeyonAuthor Commented:
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