I have had this amp for years with zero issues. Probably the last time I played on it was almost a year ago. I moved and it was transported lovingly, so I don't suspect anything was damaged that way. Here are my recent experiences from trying to play through it for the first time in awhile.
First time I plugged in my guitar, there was nothing. Zero sound. I ruled out the cable and guitar being the problem, ended up playing on another amp I have, then decided to try the Spider again. This time I could hear the guitar normally, except about every 3-6 seconds there was a really loud "POP" sound that seemed to be the same volume regardless of the actual amp output volume. I believe i continued to hear this even with the guitar unplugged. Called Line 6 Support and they said to try a few things, including a factory reset, trying the headphone jack and then possibly taking the "amp" out of the speaker box to examine the input jack. Today I started to try these things and instead of popping or anything else, there is just a horrible squealing sound that, again, is loud regardless of amp output volume. The squealing came through both the speakers and the headphones and even occurred without a guitar plugged in.
I'm guessing there is a problem with the board or other "intelligent" part. Has anyone experienced this? I saw one guy post something similar about his 75W amp and someone suggested that replacing the board for $90-$100 fixed the issue.
Any help is appreciated and thanks in advance.