You can get a new motherboard for that laptop on eBay. They are rather common (especially because of the 8400 failures). Anyway, there are a couple of Intel and AMD boards for those laptops so pay attention to the model number. You can get one for around $100. The problem is, you have to disassemble the entire laptop to replace the motherboard so it's kind of a pain. It is easier to take apart than alot of other models though ^_^