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"screen does blink" means what? Full black / white / black / white cycle but then nothing?
That should be a firmware issue then, maybe try the two finger tap reset method.
Hold the power button until the device is off (LED off etc.).
Wait a few seconds (usually takes a bit until it's really off).
Press and Hold the power button.
At the same time while still holding the power button, use two fingers to simultaneously and repeatedly tap both bottom corners of the screen.
If it works, H2O should go into factory reset mode. If it does not work, try again, most people need a few tries to get it right.
Failing that you're left with opening the device (losing warranty and water proof seal in the process) and putting a recovery image onto the internal SD card directly. There are a few posts and a youtube video regarding opening the H2O elsewhere in this forum.
Of course if you still have warranty you could just get a replacement for your device from Kobo or the store you bought it at.
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