Solved! No bootable device - Please help!

Jan 5, 2019
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Hey guys!

I just bought an expensive Gigabyte gaming notebook from somebody. He showed me it working and I was more than happy with it. However, after I tried to do a refresh of Windows to erase all of his personal files it gave me an error message, and it was cancelled. I then did something in the Windows Advanced menu, I can't remember what I clicked, and since that moment I get a 'No bootable device - insert boot disk and press any key' message when trying to load into Windows. I can get into the BIOS and see that both the SSD and HDD are listed.

Under Boot Option in the BIOS I can see the below if it means anything:

Boot Option # 1 TS128GMT800
Boot Option # 2 HGST HTS721010A9E630

I genuinely can't tell you how annoyed and frustrated I am right now so obviously any help with this would be so very much appreciated!