Sometimes it is best to just accept that it worked. Happy to see all is well!
12900KF, 3090RTX 32GB DD5 This morning I moved my PC to clean around it, now when i switch it on, the GEForce on the Graphics Card lights up, the fans start to spin but 5 seconds later the PC shuts down with no activity at all on the LED lights. I have tried the following.  I reseated everything to no effect. I checked as best i could all the cables were in place. I tried a power reset, ie removed the power cable, held the power button in for 30 seconds with no joy.\ I then reset the CMOS via the jumper which is really poorly accessible with the GPU installed and I got somewhere, because as soon as i returned the jumper to its normal slot the PC came on without me doing anything and took me via 3 ambler lights, 1 white on the front to the CMOS/BIOS reset page from where i accessed and saved the BIOS config and the PC was back up and running.  Except it was not, i can restart, put it to sleep etc, but as soon as i shut down, the only way i get it to power up again is via a CMOS reset. I have even tried replacing the CMOS battery with a new one. Anyone got any ideas what i could try next or what may be broken. My gut feeling is, it is not hardware because once its up and running, it runs perfectly. Thank You. 2 weeks out of warranty, i get all the good luck.
Aurora r13 Wont Power On Until I Reset The CMOS.