Win 8 won’t activate. Says “already being used on another PC Try a different key or buy a new one”

We get this message on Win 8 Laptop we are trying to setup for another Client

Last time we say this our Tech had to do a fresh install of the OS
interc3905Asked:
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RizzleCommented:
Has the key your using been used on another client? Is this windows 8 or windows 8.1, bear in mind the licenses are different for the two, so you cannot use a windows 8 key on a windows 8.1 client.

Also try opening the command prompt as admin then running

slmgr /upk

This will uninstall the current product key

then run

slmgr /ipk %productkey%

Then run

slmgr /ato

this will attempt to activate windows
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RizzleCommented:
maybe this may help with the above http://tweaks.com/windows/39026/change-windows-product-key-after-install/

Have you tried activating via Microsoft's telephone method? you may need to re-install Windows.
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Gary CaseRetiredCommented:
Basically the message means just what it says => Microsoft's activation records indicate this key was used on a computer with a significant difference in the system's hash code -- indicating it was a different PC.

If that's not the case, just call the telephone activation center and they'll provide you with a code to resolve this.    If it has indeed been used on another system, you'll need a new key.
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interc3905Author Commented:
reinstalled the OS which resolved the issue
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RizzleCommented:
Did you reinstall from the recovery partition or the recovery disk?

Or did you do a complete reinstall? If so did you use a different product key?
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interc3905Author Commented:
No, complete reinstall and I think techs used a different key
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RizzleCommented:
I did state the licenses were different in my first comment.
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