ah this seems like a simple confusion...I think he meant:
Motherboard, not weatherboard.
There is no such thing as a Weatherboard in a computer...just the Motherboard...which is like the single most important piece of hardware there is...it's the backbone of the system. If it's friend along with your modem, just buy a new mobo (short for motherboard) and pick up a modem...what kind of CPU do you have? I can tell you what kind of Motherboard you will need...
I recently took my computer in to a technician and he told me that my modem and weatherboard was fried and I need a new computer but after talking to several people no one knows what a weatherboard is. Does anyone here know what that is? When I turn on my computer it acts as it normally does making sounds as it boots up ,the light will blink and the cooling fan will kick on, But Then the light turns off, the computer wont boot up, and the only thing that happens is the cooling fan stays on. I have tried rescue disks and still nothing can anyone help me?

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