If you have a good power adapter (might want to swap to test), use a paperclip to press
the indented RESET button on the left of front panel Eth ports, for 8+ seconds before release.
ZD1200 latest User Guide:https://support.ruckuswireless.com/documents/2150-zonedirector-10-1-0-ga-user-guide
When defaulted, the ZD will have 192.168.0.2 IP address, with admin/admin login. If you
get this far, are you able to configure other things? Try FF/Chrome, over Edge/Safari browser.