Hi ultimate guitar!

Yesterday i was playing the guitar when suddenly, the amp went almost silent, as only a hiss/air sound is audible.

I wasn't playing loud (About 0.5/11 volume) so i doubt the speaker has been blown up. Today i opened the amp to check for a blown fuse but with my limited knowledge, the're alright.

The amp powers up perfectly except for one single time when the LED on lead i had the amp hooked up started flickering ( Aswell as the one on the amp ).

Audio example: http://www.goear.com/listen/81f5466/ultimate-guitar-trouble-cafmil

Some images: http://imgur.com/a/0NURB

Sorry for the bad quality.

Hope you can help me, thanks!. Btw: excuse me if i write in bad english, it isnt my primary language.