oh jewly, what you playing at.
steps like god told the prophet to do.
rebuild the pc, with only fundamentals aka no disc drive, mabe a hard drive. no soundcard.
power pc down, take battery out for 1 minute.
take all ram out and only put 1 stick in. keep turning the pc on and off multiple times and after several turn on/off's change the ram stick slot.
after that, if it doesn't work. consult to god and tell him your sorry for the stupid religous mistakes your parents did to you when you're young.
p.s. did actually rma your mobo in the end, because maybe this time, you should do...
f.y.i: i think you're pc has a virus because i did this once and my pc didn't start. i gave my pc to pc world and they magically fixed it and said there was a virus on HDD. so my advice is to connect your hard drive to another pc and run a virus scan. logic 0.