louism98 :
I'm considering building a new PC,
I already have a hard drive with windows 8 installed from my old PC that I will be fitting into my New PC. Will there be any issues with booting windows from this HDD from a new machine?
Yes, probably
major issues.
HDD with existing OS, moved to a new PC = sometimes it works, sometimes it doesn't. Sometimes it works, sort of, and then issues crop up later.
And then we get into the possible licensing/activation issues. Is this an OEM or Retail Win 8 license?
A clean install is always
recommended, sometimes
required.