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11 Jul 2011  

Windows 7 Enterprise X64/Windows 10 Enterprise X64/Windows 10 Pro X64/Linux Mint

That's a possibility, but I don't think it would have to do with the 4/8 pin. If anything it may have damaged the wire, but I don't believe it would have damaged the PSU. The psu would have had to put out the same amount of power through a 4 pin as it would have through an 8pin. I'm really not sure how that works, but the PSU would have been putting out the same amount of power. If it were me, I would test all other components first.
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