[DavisX]

Hi all,
I have a R12k O2, after years decided to leave me.
Yesterday I turned on booting as usual but after a while it went in stuck and an amber light. Pressing the power on button without success I removed the power cabile to turn off the O2. Plugging in again and pressing the power button no activities. Completely dead. I removed the power supply opening it first inspection I didn’t notice anything damages or leaking capacitors. I don’t’ have any spare part to test so I have doubt on psu or motherboard/CPU..

Looking for any advice
Thanks

[Jan]

You can start checking the memory DIMMs by removing or swapping them and clean the contacts. But beware that they have to be pairwise equally in slots 1+2, 3+4, 5+6 and 7+8. I don't know how many modules you have but it must always be an even number.
My own R12k O2 always shows an amber LED for a few seconds during cold start with 1 GB of RAM and then boots up normally with a green LED.

If you encounter a red LED and the O2 switches off itself after approx. half a second after power on, check the contacts on the AV module!
This is NOT shown in the trouble shooting guidelines of the O2 technical manual...

[DavisX]

Thank you for your advice. Well I tried removing memory using 2 modules, no changes will I I didn’t try removing AV module. The O2 is completely dead no power on at all.
For what I know with cpu failure or memory failure I should get at least power on with red light.
Is there a condition where no power with a working psu?

Thanks

[Irinikus]

It could very well be a power supply failure in that case!

You may want to try refurbishing it, as they are one of the more simple SGI power supply units.

One of these days we'll all have to become power supply experts I'm afraid!

[soviet]

Your best bet is to check eBay for a replacement power supply.

[DavisX]

Your best bet is to check eBay for a replacement power supply.

After done all possible test removing DIMM, jumper AV module disk and so on, according with this chart, I think a new PSU is the only thing that probably can solve my problem

[mamed]

Your best bet is to check eBay for a replacement power supply.

After done all possible test removing DIMM, jumper AV module disk and so on, according with this chart, I think a new PSU is the only thing that probably can solve my problem

cool chart recently i got two o2s red led solid, switched dims no effect switched psu no effect switched mobos worked perfectly, swapped cpu from working to non working red led switched nonworking mobo cpu to working mobo in the same case worked a treat. So the motherboard was the issue in my case. but mine autoboots to red led when plugged in regardless if I set the power on jumper by the dallas