What does the screen actually show? If it has lines on it, it is probably broken. Post a picture or there are a lot of photos of damaged e-ink screens here and on the web to compare yours to.
But, if this came on gradually, it might be the internal SD card was failing and now has become so bad as to no longer work. I that is the case, you can open the device and replace the card. You will also need to restore an image to the card and the image can be supplied. Unfortunately this will also break the waterproofing.
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