I experienced a similar problem whereby we lost power to a server and it would no longer turn on. We had to disassociate and then re-associate the server from the template/profile inside of the FI. The server would then power on but would not boot. During the disassociating and re-association one of the PCI ids' of 007 changed to 008. We adjusted boot parameters to account for the PCI id change and were able to fully boot.
In hindsight - I think we could have unplugged both power cables to the server and left it off for 30 seconds and then the power button would have worked and we could have powered up the server without having to disassociate and then re-associate the server from the template/profile inside the FI. This simple tactic may have also prevented the PCI id change.
Equipment: Cisco UCS 6296UP
Problem: Server no longer powering on after power failure / failure to boot after disassociation/re-association