1 - Quit typing in all caps. The forum will change it so every word is capitalized, making it difficult to read.
2 - You have provided no information to work from, other than what the service tech told you.
If the motherboard is fried, it has no bearing on the optical drive and such... TYPICALLY.
If there was some power issue that fried the motherboard, it's possible that event could have damaged other components as well.
You could take the optical drives and put them into another PC to see if they are recognized and read/write as they are supposed to.