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Try installing the latest BIOS version for your motherboard and located at:
Also try the processor on a 2nd motherboard to determine if it causes the same behavior.
I do have that version BIOS in place now. I do not have another board to try it in. I was upgrading to prepare for migration to Windows 7 and wanted a processor capable of supporting XP mode.
On a hunch I reflashed the BIOS (same version) and lo and behold...the "restart" button is working again! Perhaps doing so tidied up some loose ends. I'll keep an eye on it, but I think after a few reboots I should know if the issue is fixed. I'll post an update next week to let everyone know for sure. As long as I've been at this I still find the most unusual things happening.
Update: The BIOS reflash was the ticket to success. There have been no issues since. So even if you have the latest BIOS installed when upgrading your processor, you may need to reflash it.