If you're not getting anything backlight and beeps when buttons are pressed then...
Check the cable connections.
Check the cigarette lighter fuse. This same fuse powers both the lighter and the OBDII power supply.
It could be the wires going into the OBD port itself, they can be loose inside the OBD port and reaching behind the plug and wiggling the wire might make the Gryphon turn on and off. If this is the case, use an electrical connector "spoon" to pull the bad wire out, spread the little tab on the wire end and put it back in. A somewhat "cruder" fix is to use part of a tooth pick and push an end of it into the back side of the port on the hole with the loose wire, this tightens up the connection and all is good again. Not an elegant repair, but it works.
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