Hi there, Firstly let me say that you should take all that I say here with a pinch of salt. I cannot guarantee that anything i say will fix your problem, My methods are somewhat unorthodox! I beleive I have had similar problems myself before (with different mobos etc...)
if you have burnt the thing out, or worse fried the whole board you may find you have killed everything..HDD, BIOS, CPU etc etc... I have done this before. If this is the case, there is no recourse, but to test each component from your board on a board that works and salvage whatever you can.
Now to the HOPEFUL FIX!
1 - UNPLUG EVERYTHING, POWER, I MEAN EVERYTHING.
2 - return all settings to Manufacturer reccomendations. IE dont overclock it or jumper in the wrong freq etc...
3 - leave it unplugged for about 1/2 an hour (or overnight if you can) to get the power out of the capacitors.
4 - plug it all back in with THE BARE MINIMUM of devices attached and then start praying , always best to pray before plugging back in. switch it on, if it works dance a jig, if it does not, throw it across the room, and swear abusively...if nothing else you will feel better.
Hope this helps, and if not, I hope it made you smile.
Andy