Another question about my computer.

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My other thread was http://sythe.org/showthread.php?t=790294

On the same topic of my Hp Desktop with the Fried Motherboard.
Now that I took everything off that HD, I no longer need it or the whole computer, one big waste.
Can I buy a new Motherboard, swap it out, hook everything up, turn it on and it work?
Do I have to buy a new processor too, or other shit?
What would you do if you were in this situation?

 

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Nah the computer isn't that old, it's Hp Pavilion Media Center m7680n.
It had nothing wrong with it at all, wasn't slow in anyway, still worked like the day I bought it brand new.
Until it woke me up beeping loud one night, and it wouldn't turn back on after.
I took it to Best Buy Geek Squad, they verified it the Motherboard was done.
Instead of dealing with the problem then, I said fuck it, and bought the New Asus they had