WOW....something new each day to look forward to playing with these old motherboards. This morning I find that I get absolutely no display from my 4890, so I install the other 4890 and I get display, but it won't get past the LanParty screen. Won't boot even at "optimized defaults".
Again it was working just perfect last night, and there have been no leaks or anything. I'm starting to think there is a little computer Gremlin playing on my system in the night.
EDIT: I caught the Gremlin his name is ny_driver. I left the External/usb drive plugged in last night so it wouldn't boot, which I realized only as I was unplugging everything for removal. And I got the 4890 wetter than I thought. I didn't think any coolant snuck down behind the block yesterday, but I was wrong and it took until this morning for it to seep in where it was a problem. Maybe it'll work when it's dry.