ok ihave the same problem with my latittude computer sometimes is recognized sometimes is not well i went into bios and i found something very interesting .it says like this, if you are using an ac adapter with a lower it will ,display the warning in fact im using the lower watt ac adapter so im going to upgrade to the higher wattage cord which i think is 90watt and the one i have nowis 65watt idon,t which one you all have but it would,nt hurt to try if you havent