I have a small 520 that I bought from IBM maybe 20-ish years ago. It's a P05 processor group - a processor 7450 IIRC. It was turned off for 5 or 6 months, had been running fine prior.
Now it fails during power up with code B181 F22A. I don't think it even got to the point of spinning the drives.
I connected a terminal and tried a manual IPL from the front panel. The twinax card never even talks to the terminal... the cursor stays in the upper left corner.
There is one thread on this list for this. I tried those suggestions. I cleaned and reseated all the drives; cards; power supply; service processor card. One person suggested replacing the service processor battery. No joy. Replaced the service processor module. No joy. Pulled 2 of the 4 dimms (not sure if this will run on only 2). No joy. Swapped in the other 2 dimms. No joy. Put them all back. No joy.
Not sure what else to try. This box is set up for twinax as the console. I've never tried HMC. If there's a quick tutorial as to how to do that, I'm interested. Maybe HMC wakes up before twinax?
The only other replaceable items would be the FSIOP card, the Ethernet card, and the twinax / comm controller.
I'll try booting off a DVD, and a SAVSYS backup tape, but it doesn't appear that the scsi bus is even awake yet.
I don't see any swelled capacitors. Nothing burnt or charred that I can see.
The power supply LEDs are all happy.
The three main fans are all happy. The power supply fan is happy. The LEDs below the three fans show "system attention", otherwise all dark.
If it's the motherboard, my understanding is that the serial number lives on the motherboard, so I'd be screwed since my LPPs won't be licensed.
Looking for a miracle...
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