The guy I bought this from reformatted the XP Home Edition to Ubuntu. After I bought it from him I reformatted back to XP. The problem is that now it wont boot past the windows logo. So I tried different HD same problem. Ordered the original HP recovery disc and set it back to factory settings only to still have the same problem. I'm thinking MB but I tested it at the guys house and it worked with Ubuntu. Any ideas would be appreciated.