Black screen

Hi , I purchased my tone wood amp a couple of years back . I have not used it that much , however , I reinstalled it on my guitar this past week and it doesn't work .  when I first turned it on the screen was black . I changed the batteries , turned it back on , the screen was still black and it emitted a sort of whining sound and the nothing . Is there a reset switch somewhere . Any ideas what is happening ?

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