Dell apparently issued a bad batch of AC adapters for Vostro 1500 laptops. After a customer brought it to my attention that the track pad wasn't moving the cursor on screen. Plugging a mouse into the USB will release the cursor to move freely about the screen. This proves it's not a virus or a windows glitch. This Forum provided the answer to the problem. Unfortunately it doesn't look like Dell will reimburse or send you a new one. Fortunately there's always Google Shopping.