Hey guys.  I don't know if this question is getting the right exposure in the Newcomers section so I figured I'd try it over here.  This is basically copied and pasted from my first post.

This is my first post and as you may have guessed, I came here in search of an answer to my problem.  I have a Randall RH100 head powering a cab with 2 Carvin Brittish series 12s.  I have used it very little but a couple days ago when I went to power it on, it was making no sound.  I swapped guitars and still nothing.  I swapped probably 4 or 5 cords and still nothing.  Made sure the guitars were turned up, plugged them into another amp, etc.  Something is wrong with the Randall and I can't quite track it down.  I have noticed with the guitar turned up all the way and the level and gains turned up all the way, I can hear a tiny amount of sound (whatever I'm strumming) come out of the speakers.  Also, it's either clear or metal, so I know that part of the amp is working.  I'd just say the total output of the amp is probably 1% of it's potential?  I've taken the amp apart, searched and scoured for burnt spots on the cirvuit board, bad resistors, loose this or that, I just cant find anything visually and though I am not brand new to electronics, I'd have no idea where to start as far as formal troubleshooting.  :grr   Anyone had this happen? 

P.S.  As a side note, the one thing I noticed is that the tiny amount of sound I can here is not effected one way or the other by the moving of the master volume control...

Thanks.
-Andy