dolt

My spider valve when turned on shows 8 black bars on the lcd display , nothing else works , i cant get no sound at all . I try to change the presets but cant get rid of the 8 black bars . I have only had this amp for maybe 18 months and i have seriously hardly ever used it , i just turned it on the other day and all i now see is 8 black bars . Please help as i am wanting to sell this amp and my podxt live and my epiphone as i just dont use them anymore .