<<Tried to reinstall XP.>>
What is the source media you are attempting to use? If it's anything other than a MS Genuine XP CD...and you changed the motherboard from that which is reflected on any clone, recovery CD, or illegal download...you're probably not going to be usccessful, since the drivers from the old motherboard/components...will not be the same as those of the new motherboard. "Install disks" provided by an OEM as part of the support for a given system...are not the equivalent of MS Genuine XP CDs when it comes to installing Windows XP.
If you are trying to use the same XP install...with a different motherboard...you can expect problems. The links following are provided as the thoughts of others on such projects.
Changing a Motherboard or Moving Hard Drive - http://www.michaelstevenstech.com/moving_xp.html
Move Windows XP Hard Drive or Change Motherboard Without Getting Blue Screen of Death » Raymond.CC Blog - http://www.raymond.cc/blog/archives/2008/07/09/move-windows-xp-hard-drive-or-change-motherboard-without-getting-blue-screen-of-death/