The page lists the motherboard as using a KM266 chipset, and shows Sempron support for OTHER boards, but not this one..
The Sempron is a 333FSB (166 clocked) CPU, and it MAY run at 80% speed in a board that only goes to 133.
I'd concur though, unless you have a cheap old original Duron, or some other throwaway CPU to test with, you could be wasting money on a CPU for a dead motherboard, or even a motherboard that will kill the next CPU.
In fact, after a failure, the problem of "killer components" can be serious - with parts, either those that caused to problem, or others damaged by it, waiting to destroy the next system..
I'm not kidding, that kind of failure chain has happened before, and will happen again.
PS. RAM - if it's DDR266 and not much of it, that would also be a very poor match to a new motherboard and CPU of 333/400FSB