Is it a genuine Dell AC adapter?What model laptop? Does the adapter have the barrel-type connector or USB-C connector? If it's a genuine Dell adapter, boot while repeatedly pressing F2 to access BIOS. Is the adapter recognized in BIOS? Next to "AC Adapter Type", if it doesn't recognize your adapter, then there is a problem somewhere. Also: [URL]
"Alert! 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.” Is the message I get when I turn on my computer, in very rare cases my laptop does charge and I use it but when I checked my AC power adapter status it said "unknown". I ordered a 90WT charger to see if my laptop charger is too weak but if you can tell me the actual problem it would be greatly appreciated.
AC power adapter wattage and type cannot be determined.