Hi everyone! Was wondering if you can throw some guidance my way? I have an HP 8300 SFF computer. I received a new Evo 840 Pro. The Evo was initialized by me with GPT without an issue and all the proper bios settings were set. I was able to successfully create an UEFI flash bootable drive and install Windows 8.1 on GPT. Windows was running perfect until a power outage and now I couldn't boot or repair. Reformat time! I used the same usb drive and chose the proper EFI boot source. I just use the delete partition option in the Windows GUI and it should automatically install in GPT again right? Windows installs and then at the very end it states: "windows couldn't update the computer's boot configuration" when finalizing. Great... Ok.... I then proceeded to diskpart the drive manually in Advanced Troubleshooting off the Win8DVD/USB. No issues in setting up the drive for this. Time to install windows. I installed Windows again and received the same error during finalizing. Sigh... I then plugged in the SSD via SATA cable into another computer and tried to format the drive + set to GPT. This was done through the Administrator Tools area of control panel. This finished. I threw it into the HP SFF and at the finalizing part, "windows couldn't update the computer's boot configuration". Now I am getting very sad Samsung Magician Tool. I had to create a bootable flash drive. No problem, got that made. I issued the secure erase command and followed the directions to unplug the ssd from power then back in. It looks like it is doing something, but after about a minute it just says "Cannot Set Password". I nor the bios, nor the disk had any passwords. Bitlocker wasn't running as well. What the heck? Just for giggles, I tested installing Windows 8.1 in MBR/Legacy mode. Windows installed perfectly without a single issue. Then I recreated the disk into GPT and got the same errors. I am 1 x 10 ^ infinite power certain that originally I indeed was running UEFI/GPT. Please help. What gives? Other steps I have tried was to disconnect all SATA devices and only leave the HD. Another step I have tried was to change the boot priority order to the top of the mountain.