Call the supplier and make it their problem.
Bob
PS. If you built it yourself, then where is the parts list? Is the BIOS the latest and more.
I installed a new mobo. Asus k8v se deluxe. AMD64 2800. POST is fine & says computer now booting from operating system. WindowsXP SP2 mode selection comes up (safe,normal,last good etc) then just keeps trying to reboot over and over. Tried to use windows xp oem cd to reload windows but nothing new happens. Please help.

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