I have a Dell Inspiron 1000. I have been doing some work on it. I replaced the display, the hard drive, added a wireless card and upgraded to Windows XP Pro. Everything went off without a hitch. I played with the laptop for a week. I did all the updates with no problems. Then I turn the computer on and it just hangs at the Windows screen. I have run Dell Diagnostics and even replaced the hard drive with another brand new one. I have reformatted the hard drive and the computer starts the installation process and stops at 35%! Everyone I ask talks about RAM. But, of course, the RAM is onboard so I want to know if there is any way to disable it or do I really have to replace the motherboard?