F3 will only suppress the error - - it will not fix the problem. One of three things is bad: The AC adapter plug, The DC input jack, or the charge circuit on the system board. If the system is in warranty, call Dell.  If not, try a new OEM adapter first.  If that isn't recognized, replace the DC input jack.  And if that doesn't get the adapter recognized, replace the mainboard.  
[IMAGE] F3??
Alert, what should i do?