Was the "Clicking" accompanied by the smell of burning plastic? Puffs of White smoke?
Been there, done that. Fortunately, MB and PSU were replaced by the shop that built it. It was under warranty.
What woke me up, were the capacitors popping! I turned on the light and saw a faint trail of white smoke. I pulled the power and went back to bed. Packed it up the next day and had a new one, end of that same day!!
It's too bad that shop closed down this past Summer. I loved that place! Every one of my computers, thus far, have been there or have a piece purchased there, in them. i.e. fan or memory....
/Rant, Sorry about de-Threading this post...