It's most likely not the e-inkt as the entire screen shifted to the right. If something went ploink inside your reader it's more likely that the screen controller that kicked the bucket...
It could also be caused by a drained battery, that doesn't get enough power via USB to recharge, it has happened before. Readers are known to do weird stuff once they get to low on electro juice.
Maybe recharging it via a PSP adapter would fix it...
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