Win 8 64 bit VM stuck in rebooting loop ESXi 5.0
Are you running ESXi 5.0 Update 4?
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Fresh install? If you're running 5.0 have you applied update 04?
but in interoperability it shows as 5.0 U 1 and U2 and also supported
Per the KB we both mentioned, Update 4 is the point where Windows 8 and Server 2012 became fully supported. I would try patching to update 4 and see if that helps.