I've got a BIOS that hides the Xbox boot logo. You get about 10 seconds of black screen and then it does the biohazard symbol for a couple of seconds.
I've got to admit that I'm personally getting to the point where I'm about to pull my Xbox out of my pedestal cabinet. There's getting to be too many homebrew/newer PC games I'd like to play on my cabinet and the Xbox is getting unreliable. Seems like I'm reseating the hard drive and power connectors fairly often now.