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My computer was having issues yesterday when I was trying to use zoom, but today I can’t even get in to the computer. It says Boot Device Not Found. Please install an operating system on your hard disk. Hard disk (3F0) F2 System Diagnostics. I don’t know what this means.

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You did not disclose your computer model nor the operating system.

 

Typically, something went wrong on the har drive and it cannot boot up.

 

Boot a  windows repair CD or USB and do a "startup repair"


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