Posted 2025-06-16 | Back to blog index
I figured it couldn't hurt to drop in to HARD OFF on my walk back from the mall.
Wandering through the Junk PC aisle, a double-take, what is that teal beauty on the bottom shelf?
A SiliconGraphics O2? In MY rural Japanese city? How did that get here? The tag showed it had been there for over a week. At $60 I had to give it a home!
Lugging it home in the 31+C heat, squeezing in on the tram and dashing through the rain was a slog but it made it home!
It looks to be in somewhat decent condition! The optical drive cover is loose, there's sticker reside and some scratches on the side.
It's super modular and the bits just slide out! It's a bit scary to when it requires a bit of force on these old plastics...
The SCSI HDD and Optical drive are missing (should be easy to replace), but most importantly, it is populated with CPU and RAM!
The label at HARD OFF said the LED turned on when powered on, but I was getting zero life. No LED, no fanspin.
First look at the PSU... Well that's a problem.
It was easy enough to unscrew the PSU and re-seat the pin connector. It didn't fix the problem.
When I had the PSU open I also beeped out this fuse which was fine.
Doing a quick web search, it seems a common fix is to set this jumper on the logic board.
This did nothing either...
Hi, my name is David
Jumpering the power on pin on the power supply resulted in no life, no voltages. So I guess the power supply is dead!
update: Also no voltage on the 3.3V standby power pin
So... Anyone out there have any hot tips on debugging a dead SiliconGraphics power supply??