I was installing os 6.0.8 onto the external SCSI drive on a Mac Plus when suddenly I heard a loud pop and smoke started pouring out of the top of the computer! AGH!  The screen flickered a bunch but the machine stayed on, of course as quickly as I could I powered pulled the power and opened her up.  

My question is, could I somehow have caused this?? 

Next question is where I do I start to repair it?!