If you've replaced the battery and AC adapter, the only option left is the motherboard. If the system is under warranty, make it Dell's problem. Otherwise, if you want to try it yourself, you can see what a replacement board for your system might run you at http://www.parts-people.com
My Dell Inspiron 1501 AC adapter became not recognizable and the battery not charging. I did replace the Ac adapter and battery, but my power meter showing the same level of % ( 34% )( plugged in, not charging.
Do u have any suggestion