Hello all!

I've recently bought a Fender Frontman practice amp off ebay. it was fine for a few hours use but now all it does is buzz. It's doesn't stop buzzing/humming when the strings on the guitar oare touched/earthed either.

I'd like to fix it but don't know where to start. I've opened it up and the internal fuse is ok so I'm taking a wild guess it's a capictor or something that needs replacing.
Hopefully not a speaker issue??

Any suggestions/ideas welcome.

its  15watt Mexican made one, Model PR241 I think??