Zkoušel jsi očistit kontakty vozíku s cartridgemi tvrdou pryží?

Případně zkus reset do továrního nastavení:

Unplug the power cord from the unit.
Reconnect the power cord into the unit.
When the lights begin to flash, press and hold the Power and Cancel buttons.
When only the On/Resume light is flashing, release the buttons.
When the On/Resume light is steady, the reset is complete