Slight Hum From Mini Comp...What It Be?

[Junk Yard Dog]

Played a gig two weeks ago, and then plugged in my Splawn today and noticed there's a slight hum with the volume and gain turned all the way down. Almost like a 'transformer hum'. It definitely was not there before.

I'm sure it could be a number of things, but just seeing what you guys think it could be based on your experiences.

Checked all cables, electrical outlets, etc. It's definitely the amp.

Cheers.

 

[311splawndude]

Dumb question but did you put everything back exactly the way it was?