Well, now I'm officially confused - I thought the HP power supply was your spare, not the faulty one.
Sorry... yes, I have an HP Elite Desk 800 as my spare PC and it turns out the broken PC in my cab is also an HP something.
I also have that other more normal looking power supply from another cab that has been malfunctioning (computer is constantly turning off and on rapidly - haven't done any troubleshooting yet).
Found this on ebay (sadly ebay Germany). Looks remarkably like what you might need.
Oh man - yeah, those look like they should work. Same connectors but more power.
This all assumes that the issue is the power supply! I really hope this is an easy fix - I hate not having a working cabinet to play. All 3 in my basement are in various states of not working...
