I have a Sony PCG-F290 and it crashes during startup of fresh install. I was installing Windows XP Pro and I went through all of the blue screen stuff ex... partition, format, installing certain files. After that was finished, it rebooted and It is about to startup where the white blocks go across the bottom of the screen. Then everything goes black and it shuts off. The powre light stays on and a fan is spinning but nothing else and it doesn't respond. I used PC Check to test the RAM HD (both read and write tests), Video and MoBo, everything passed. I removed the HD and tested it on another machine, it read fine. I replaced the RAM and it did the same thing. Could the motherboard just be bad or what else could it be?