You were probably stuck in FEL mode, no need to disassemble the device. There’s an explanation on how to get out of it here: My device is not booting!
Now that you get it to boot, if you can hear the navigation sounds, just increase the brightness with menu+volUP
And don’t ever use the reset button when stuck in these situations, use the safe shutdown or safe restart hotkeys: When should the reset button be used?