R11 Chromebook stuck in screen test rotating colours mode.

RrnR
RrnR Member Posts: 1 New User
edited November 2023 in 2020 Archives
This problem occurred on the grandson's device spontaneously while he was using it.  Suddenly the display went into a mode where the screen cycles through red green blue white black, with around 2 seconds on each colour.   The only exit is by powering down.  A long press of the power button is required to power it down - a  momentary press is ignored.  No other keys are active.  Can't access the factory reset (long press of refresh, power button). When the unit is powered up again the fault resumes immediately.

Any suggestions welcome!