Dual 1.8 G5 Dead - anyone know of discount logic boards?

My G5 dual processor died on me. At first I was told it was the power supply, and i got a new one. It worked for two days and then died again. Now I'm told it's the logic board, which, installed, costs over $900!!
Has anyone had this kind of experience, and if so, where can i find a logic board that does not cost more than a brand new laptop!?!
powermac G5    

Unless you are a real hardware GURU and have lots of time ant pateince doing a G5 motherboard swap is not for the faint of heart.

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