Issue #446 has been updated by Michał Żygowski.
You could try to get early log message over the serial console or the flash console (CONSOLE_SPI_FLASH, cf the Kconfig help text).
I recall CONSOLE_SPI_FLASH causing the OptiPlex to hang at postcar, so I doubt anything useful will come out of it.
Try removing the CMOS battery, unplug the power supply cable, and let the board discharge for about 30 seconds. In some cases it helped. I will try a fresh build with SeaBIOS to see if I can reproduce the problem.
Also what was the power button LED color? Was it blinking orange?
---------------------------------------- Bug #446: Optiplex 9010 No Post https://ticket.coreboot.org/issues/446#change-1340
* Author: Aaron Burton * Status: New * Priority: Normal * Target version: 4.19 * Start date: 2023-01-09 ---------------------------------------- Working with an Optiplex 9010 SFF, configured and built coreboot as usual against the Optiplex 9010 SFF platform in menuconfig. Left every other setting alone in terms of configuration. Included EC firmware, ME, GBE, IFD blobs from stock firmware into my build. Turns on with fans at normal speed (not full blast), but no keyboard illumination or display output. Using SeaBIOS 1.16.1. Any suggestions as to what may be going on? Thanks.