Replace the motherboard. If one cap has blown, then the chances are that other components have also been damaged. It is also not possible for a local electrician oke to replace the cap, as the motherboard consists of layered micro soldering. Sorry, but my advice is to discard the motherboard, and get a new one...
Which mobo is it? Some of them are repairable. I've fixed a couple of them already.
Thanks I'll check it when I get home then post a reply first thing tomorrow.Get the exact model number and I'll check it out for you. Maybe you can tell me what the voltage/etc. is on the cap as well.