Old MBR information could be corrupting the behaviour of the new OS and making it think it is a ghost of its former self. Sure, every A+ certified tech knows MBR doesn't contain video drivers but stranger things have happened when the OS doesn't know what it is. Scat is talking from experience.
Though, I am afraid this OP will turn the drive into a paper weight. Happens to the best of us.
That's a good description.
I doubt he'll brick his drive. I gave him proper instructions, and they work very well. I've done LLF many times over the years and never had a failure using HDGURU's LLF utility