All things mac and macOS

I've got a pretty old macbook pro, I would assume it's intel. I'd installed refind and debian on it then just left it for a while. No damage that I know of, but I did move houses. Now, I plug it in and the power cord shows green, and the battery indicator shows blinking fully bars. I have tried all the keyboard things to reset, but no luck. Is this thing fucked, or are there any possible solutions? Thanks for the help guys!