Switch OFF and disconnect from the mains.
Disconnect the aerial.
Reconnect the mains and switch ON.
If it now comes on and stays stable go into the Installation menu and do a Default Setting.
Switch OFF and disconnect from the mains.
Reconnect the aerial.
Reconnect the mains and switch ON.
If it now comes on and stays stable go into the Installation menu and do another Default Setting.
The machine should now work again.
Note, disconnecting from the mains before disconnecting/reconnecting the aerial is to comply with the Humax warning sticker on the machine somewhere.