OK, I know, a little off topic from band, but I am having a problem with my amp that maybe my fellow Gaian musicians could help me with.

I have a Fender Frontman 212r amp. With nothing plugged in, or all the knobs turned to 0, the amp will make a loud buzzing noise, go quiet for a couple seconds and then make a loud pop.

Anyone have a clue what it might be?