Random Shutdowns With New Rebuild

I have begun experiencing random shutdown with my system. I recently re-built my first build adding an SSD, new motherboard, graphics card and memory. [code] I ran the SF Dx tool and included screen shots of CPU-Z tabs and CBS.log filtered for just the SR (system restore) points from the sfc /scannow. Included all files in the zipped Seven Forum folder attached.random shutdowns-periodically I will return to my computer and find a screen asking for a boot drive. hitting space will not work.i have to shut down using the power on button.Usually it boot into windows after the first time.Occasionally I have to power on and off a couple of times.screen bland for 10 to 20 seconds. Occasionally while switching between applications using Alt-Tab the screen will go blank for up to 20 seconds.It recovers on its own with a message saying my GPU shut down and was restarted. I have never actually seen a BSOD (am I in the wrong forum?) but would like to fix these problems.For a time I thought these were problems with my SSD and GPU but when I ran sfc and saw the number of files that weren't repaired I started having concerns.Oh and by the way I have run a variety of diagnostics on the SSD and GPU and nothing was revealed.