A HP e3000 (Series 900) system undergoes a self-test upon reset.:
After resetting and testing, the system either autoboots or
initiates an interactive boot sequence. Whether or not the system
autoboots depends on how the autoboot flag is set and the presence
of an autoboot file. For information on using the AUTOBOOT command,
refer to Chapter 3 "System Startup Functions"
Determining and Selecting Input and Output (I/O) Paths