What message/ log notice you about coorupted FW/ ILOM ?
At this momemnt system detect: Description : Memory DIMMs are not populated.
Check: How many DIMMS realy installed at server ? What type ? What slots populated ?
Try replace DIMMs. Also may be MB is bad.
I've been using system for years now, the problem started when I tried to upgrade to latest firmware (BIOS/ILOM). Unfortunately, I did the firmware upgrade remotely, and I think system did not come back up so I tried to power cycle it remotely. It never came back up.
I haven't touched the DIMMs. I can try to pull them out and then put them back in again.
How can I rule out the BIOS problem (can I recover that somehow?)