Hey guys so I got a crate xt120r amp from a buddy saying it does not work.  Here is the deal the first time I plugged my guitar into it just to see what would happen it worked. However it did not last long before it quit.  Now a couple clues for you guys I hope will help you to help me solve this mystery lol.  First off the power switch itself lights up when I turn it on indicating power. Now during that initial power on I did when it worked the led indicating which channel, clean/distortion I was using also lit up but as soon as the sound cut out so did the led light and has not re illuminated since and sound has not returned once since then either.  The fuse in the back is fine and I have it torn down to the board as we speak and can see no visibly bad solders or fried components. Any ideas would be awesome guys  :tu: I have a multimeter and know how to use it, but cant find a schematic showing me test points and values anywhere. It has a SLM electronics board if that helps. Thanks in advance for any and all help. I did search on here for awhile so if this issue has been discussed already I am sorry if I missed it.