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Why isn't my adapter responding to my computer?

"The AC power adapter type cannot be determined. Your system will operate slower and the battery will not charge. Please connect a Dell 90W AC adapter or higher for best system operation."

I have a 90W adapter plugged in- and i continually get this message. its relatively new, and i have not broken any small wires inside of it, as i have been taking EXTRA special care of it since my last one broke. What needs to be done to remedy this?
 
sad I’m frustrated
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