I will explain things as well as I can, but even after a bunch of reading, I am still not too up on UEFI. I generally deal with high level software.
So I have a preinstalled Windows 8 system that would boot in UEFI mode with secure boot. I needed to also install Ubuntu 12.10 and I did so. To boot in Windows, I would set secure boot on. To boot in Ubuntu, I would set secure boot disabled. In either case, I used UEFI mode.
Later, when playing with Ubuntu, I was working with petitions and I messed it up such that the hidden recovery partition was gone and Windows would no longer boot.
I recovered with Windows 8 Enterprise Evaluation which I burned to a DVD. To install, I changed to CSM mode (BIOS legacy) and installed it just fine. After install, I could boot from the new OS in CSM mode. If I try to change to UEFI mode, the computer says no bootable media is present. When I then change back to CSM Mode, I get some blue screen with
winlogin.exe error and I can't boot and my Windows 8 Enterprise is not directly accessible. I then put in a WinXP recovery disk, do automatic repair, and it fixes whatever issue was causing CSM Mode to fail, allowing me to boot from Windows 8 Enterprise Mode again. So I am left with a Windows 8 OS that will expire later this year, not the Windows 8 that came with my system.
Now, I have a recovery USB for my original Windows 8 OS which came preinstalled with the computer. Supposedly, it is a UEFI bootable USB. When I boot from CSM Mode, the USB is recognized but after a minute I get
BIOS is not UEFI. When I boot from UEFI Mode, the USB is not recognized at all and I get the familiar no bootable media message present.
I reflashed the original BIOS with flashit and nothing bad happened but nothing improved either.
So how to I regain that UEFI boot capability? It doesn't seem I can boot anything in UEFI mode any more