windows 8.1 Pro fail to boot when adding Hard Drive

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not try to take you off course but the 2tb did it come from another PC, I took one out of a old DVD HD (500GB) recorder a time ago and it was not recognized till i reformatted, if you don't have any  important data on it try that, or disconnect your win 8 /7 drive and try install a linux or another windows system on the 2TB one just to see if its working bit of elimination thing you have no need to go set all the software just get to the desktop, then put in your win 8/7 drive back in and boot to windows 8  and look if its recognized your 2TB drive  go into computer in windows 8 / 7 if you see the 2TB drive is showing then you can reformat it, are you just using it for a backup the 2TB, if so you can buy a external hard-drive caddy and put it in there, i not the best at explaining but just trying to help if mods think this will not help please remove no problem good luck