Issue while upgrading firmware

[elw at stderr.org]

> I have ran into a problem, though.  During the OFW "ok" prompt, I type 
> "flash u:\q2d07.rom", the systems reads the new firmware, but then gives 
> me the following message: "AC not present" and stops.  What am I missing 
> here?  What is AC exactly?

Alternating Current -- you really want to be plugged into a wall to 
upgrade firmware.

[Complete loss of power - what you get if your battery runs down - may 
brick a machine in the middle of its firmware update.]

--elijah