Most cases found of HAIKU not turning on comes from a low battery. Please try again to push its buttons after 1h charge. (As soon as HAIKU is plugged on USB charger, it charges, even if nothing displays the charge process on the device!).
If previous step does not wake HAIKU up, then it happens that a firmware failure locks everything. A firmware update from the app could help to unlock the situation.
Contact us via this platform if the issue persists :