crwdns2934241:0crwdne2934241:0 joshua fiu

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Can't Access BIOS Settings using F2/F1. Operating System not found.

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I turned on my laptop, boot settings appeared, pressed the F Keys  BIOS not appearing than next thing Operating System Not Found. Please Advise me what to do and how to go about fixing it!

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Lenovo ThinkPad T520

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open