AMD computer won't boot up

This morning, my uncle couldn't get his computer to boot up, and I'm not at all familiar with AMDs. Once I opened the case, I smelled ozone so I knew something had fried. I swapped the PSU and still nothing, no lights, nothing whirring so I figure it's the MOBO, a GA-72XE. I'm researching new motherboards that can take a Athlon XP 1800 proc. Any suggestions?
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Edit// OK, I took a magnifying glass down there and found some serial numbers. The CPU is an Athlon XP 1800, u.13, OPGA, 1.50V, 256KB Cache and it runs at a 266Mhz FSB. The video is an nVidia CM64A TNT2 32MB AGPx(?) and the Ram is a stick of Micron 512 PC133 168 PIN SDRAM
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