I used my bass with my amp 2 weeks ago and the sound was fine. Now I plug my bass into the input, the sound won't come out. I put the volume up high to see if the amp was broken but there was a noisy grainy sound that came out so I thought that the cord was broken. I bought new ones today and tried them out but the sound didn't come out. I tried re-plugging my amp somewhere else but it still won't work. Can someone help me out? Is my amp broken or is the bass broken?