Smoke, lots of smoke

[Raz316]

So I plugged my PC in for the first time in about a month (ive been looking for somewhere to live). Basically, it instantly started bellowing out smoke (plastic smelling). I yanked the power out and opened it up to see what the hell was going on.

I unplugged all the devices and started it up again. Instantly a couple of channels down the right hand side of the board started glowing red hot and then more smoke (from the mobo plastic melting).

It was lucky I didnt leave the room for my PC to boot. Basically the question is, what the hell would cause this? :/ could have been seriously dangerous, and certainly not a good way to move into a new place.

thanks

[Clunk]

Anything been spilt on the pc while you have been moving house? or something metal could have come loose inside and shorted on something else.