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Kind of funny reading this.... I noticed recently as well that my D80 was flashing ERR. Thought was the SD card and/or the contacts. Anyway, long story short, finally discovered my battery was low, causing this. I occasionally throw in a replacement/backup battery, just to keep it fresh, since I don't use it that often. The recent times that I've noticed ERR on my display was the times I had the backup battery in. Basically, the battery is shot and dies really fast. Once you start getting low in battery life the camera doesn't want to work and will do all kinds of weird things. ERR, flashing, etc. Anyway, good luck!