OT: I need a new motherboard.

[Fyron]

If any capacitors are blown, they will be charred on the top.

Replacing the whole system without checking to see if individual parts are still fine is pretty wasteful..

"Do both cores of the featured CPU go at 2.1GHz? "

Each core on a general purpose CPU is more or less functionally identical.

You also want to see if the ram you have will work in a new potential motherboard, make sure it has enough slots for your expansion cards, make sure it has the right video card slot type, and check that there will be enough connectors for your hdds and optical drives.