New build, weird infrequent errors

Get_off_my_plane

Honorable
Jan 24, 2014
36
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10,530
My new build (windows 8.1) has been running good, but at least once a month I get some weird crash that forces me to restart. Usually it's a BSOD then afterwards the message "Reboot and Select Proper boot device". But this last time it just crapped out and brought up the message 'No operating system found'. Typically it takes a few tries for it to boot back to windows, unless I insert the installation media.

I'd really like to know what's causing this. I have tried reformatting before so it's not software related. Will be opening up my case today so if you have any suggestions please let me know.