Unknown disk not initialized

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This did nothing but change the issue to a 'no bootable device' error. I tried booting and pressing F2, then selecting save and exit, as advised on the acer forum. it spent 2 days with the acer screen, and the loading wheel.

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it worked fine after this, i watched an episode of a show online, and then closed the laptop and went to bed. One evening it was slow, so i restarted it. I have a very stressful and ongoing problem I'd like help with, please.Ībout a week ago, my acer swift 3 was working fine (windows 10).