Its the debugging thing I think is important. It is too easy to lose self confidence when setting up hardware when it doesn't come on.
Thought process is:
1. #### #### ####!
2. Did I hit it with static electricity - I forgot to touch the radiator pipe before opening oh no that will invalidate my warranty.
3. Right, dissemble everything and start it without anything in.
4. #### #### ####!
5. Oh no, maybe I wasn't supposed to start it without anything in, maybe Ive ####ed it up by doing that!
6. Manual. Wheres the ####ing manual.
7. Ive got no bloody manual!
8. Ah schematic. What the hell does all this mean? Locking nut A and Flange B! WTF a flange?
9. Internet, Ill ask someone on the internet.
10. Oh no! They don't know what it is either.
Versus
"IF your Pegasos does not come on, don't panic, switch off and run a terminal program on another machine, plug in the provided serial cable between your debug machine and your Pegasos and switch back on again. It will give you an X-digit code. Here is a print out of what these mean"