I should also point out that my machine has been worked on by a now departed friend of mine when the original keyboard went out and when the original hard drive stopped. A replacement keyboard from original known working parts was installed although the left arrow key and u key have separate issues so I use an old full size usb keyboard in it's place. The hard drive was changed to a SanDisk extreme ssd as well. And the display was also replaced when the stock panel broke. The machine has continually stayed alive throughout the years since 2007 and have had no motherboard or power issues since then.