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#11
Try running a couple of Startup Repairs with reboots. This tends to sort these issues.
Startup Repair did nothing. Though I think I found my problem. For some reason I can not capitalize my "x" key with the right shift key. I wonder if something is going on with the keyboard. When I unplugged the keyboard it seems to not bring up the boot manager.
Try another keyboard.
Is this a USB keyboard or PS2?