[blahfod]

are you connecting to a TV or monitor? It seems that the resolution used on the SeaBIOS boot screen is not one that all TVs can handle. You can always try blindly selecting your USB installer by pressing [ESC] then [2] and seeing if the installer screen comes up. You might have to play with the timing though. I just reset / reflashed both my i3 and celeron ChromeBoxes here to make sure everything is ok with the files/script, and it appears to be.

Created an account just to comment on this. I had the same problem as blahfod...exact same.

I blind booted, escape, then 2 and voila! It worked. I'm using a hdmi to DVI cable on a POS 1680x1050 monitor for reference.

Thanks Matt! You saved my night.

I may be having the same problem, though the blind booting hasn't worked for me so far... When I turn on the ChromeBox, I get power (the fan spins, and the USB devices are powered), but no video signal at all over HDMI. Neither my 1080p television nor my 2560x1440 monitor work. I've tried the blind [ESC] [2] thing a bunch of times, to no avail. It shouldn't matter which USB ports the keyboard and bootable drive are plugged into, right?

This is what i did to get it working. Disconnect power from chromebox, wait, plug back in. turn on chromebox, (my usb stick has a light that indicates its being read) when you figure the usb stick is powered (5 seconds or so), press esc, then press 2, then press enter. (sounds dumb, but i wasnt pressing enter when trying esc-2 over and over. doing exactly as above sjhould do the trick.
blahfod