[SGIArtist]

Because my new O2 was quite loud, I decided to replace the PSU and CPU fans. After replacing the PSU fan the machine worked without a problem. Then I replaced the (R10K) CPU fan for a noctua NF-A6 PWM. After pushing the system board back into the machinem it's now stuck at boot with an amber led. I have to unplug the machine to shut it down and when I plug the power cord in it immediately starts the machine up. Pushing the reset button, the led turns red briefly, then becomes amber again. According to the reference manual flow chart it's a system board problem. I popped the RAM and pushed it back in. I also re-seat the CPU. Output to the serial port gives nothing.

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Is there anything else I can try? I did unplug the power cable every time I removed the system board or put it back in. I also put the original CPU fan back but the problem still persists.