Well, apparently the items noted above didn't help as the server dropped offline an hour ago and it looks like my data center has to power cycle it to get it back online. If I install the developer's kernel and get the panic information, is that likely to tell me what the cause is since the system BIOS isn't detecting in the DMI event logs?
All this work has a real cost ($135/hour for remote hands at the datacenter) associated with it, not to mention the cost of renting their IP KVM.
Edit:
The server had rebooted and was hung right after the memory count at POST, so this has got to be a hardware issue. Eff'ing A.