My Dell laptop is displaying this message upon booting up. I have no idea how to start fixing it or figuring out whether it is fixable. My dell charger is worn out, and the computer has not recognized it -- it still gets power to the computer, but the computer does not recognize it as a dell charger, and therefor I can run the computer on AC power but it cannot charge. I haven't needed to use my laptop out of my house in awhile so I haven't really worried about it, but can the fact that the battery has been totally drained for awhile (about a week, I think -- and totally drained, if I unplug the charger it turns off immediately) have something to do with it? I have it on a working charger right now trying to revive the battery, but the battery light is not on so I don't think it's even charging. If trying to charge it doesn't help, what do I do? I can still run setup and the boot menu but I have no idea what to do when running these.