SGI: Hardware

Octane upper/HDD fan...

So, I noticed that my octane's upper fan was out a little while ago. I took everything apart, and replaced with a known working
fan. I wired exactly as the old one. Now, it still doesn't work. I'm pretty sure there's no voltage at the header, but its a little hard to test
without running leads out the back, and reassembling. Is it cooked? Can the power rail get shorted or burnt out easily? I'm guessing
this is going to mean swapping in a new frontplane. Just checking if anyone has had a similar experience.