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does the power led light up at all? does it start blinking? does it stop blinking after a while?
not sure if it's still the same for the libra 2 (didn't test), but for the original H2O it was:
led turns on - but does not blink - goes off after a few seconds ==> device powers on but SD card could not be found or read successfully
led blinks - device is on, sd card found, boot sequence started
if the display has no reaction in the blinking phase then the display is disconnected or broken, while the device it self may be working fine. if you set up wifi you might even be able to ping it for a short while after booting, before it turns wifi off again to save power.
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