My Matrix6 has a problem which, over the years, has grown increasingly worse. On occasion, switching the unit on would have no effect. Switching it off and on again usually would successfully power it up, but sometimes it would take more than one try, with the display having all the LEDs lit up, or else displaying some cryptic message.

Holding down the 'Store' button, then switching the unit on also used to work most of the time, 'Calibrating' the unit in the process.

Now I can't get the unit to power up at all. Throwing the power switch on-off-on rapidly will cause the display to light up with PWPPPPPPPPPPPPPP, but the unit doesn't respond otherwise.

Anybody ever seen this display? Or know what it means?