This one is strictly for electrical engineers . The 40 odd Dell Vostro A840 laptop we have on campus sometimes stop booting with this warning screen. If you figure this out, do drop me a line.
Warning
The AC power adapter wattage and type cannot be determined.
The battery may not charge.
The system will adjust the performance to match the power available.
Please connect a Dell 65W AC adapter or greater for best system performance.
To resolve this issue, try to reseat the power adapter.
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