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#21
What were the results of the hardware tests?
Try resetting BIOS to defaults after noting the SATA controller setting: Clear CMOS - 3 Ways to Clear the CMOS - Reset BIOS
Run a few Startup Repairs from the booted installer.
If the problem didn't exist before you did the repairs which moved the System Boot files, then back up with a System image, Mark C Partition Active then run Startup Repair - Run up to 3 Separate Times to reflag the System to System Reserved partition.
I notice someone removed the System Reserved label from that partition. If you messed with it in any way like formatting, then you may need to manually copy the System boot files from C (after unhiding System files in Control Panel>File Options>View) to System Reserved, temporariiy giving it a letter in Disk Mgmt for this purpose. The run the Startup Repairs again until it boots and SysReserved holds the System flag.