Well percentage won't help much. You should start by disconnecting everything that's not entierly vital. This means leave only mobo, memory, cpu, graphics and internal speaker plugged in. If there's still nothing remove the graphics. If still nothing (no beeps) then it's most likely your mobo.
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS