Thanks for that. Your CPU is supported by the 'shipped with' BIOS version, so that part is good.
What do you get when you power up? It lights up, starts to spin and immediately reboots over and over? Does it take a moment before the reboot?
I think the first thing I would do in light of not knowing more would be to go into the case and check the connections for your PSU to every component. Reseat the RAM and GPU and just generally make sure everything is connected tightly to where it is supposed to go.
If you disconnect all the storage drives (SATA connectors, for instance) check to see if it will boot up and show a "no OS/boot drive" warning.
Most motherboards can be set not to show a splash screen, so perhaps try to hit F12 or Delete key when you power up to see if it will go into BIOS.
Might be worthwhile to attempt to reset the CMOS by either shorting the pins on the motherboard for said or removing the coin battery for a few moments then putting it back. Make sure system is powered down and unplugged and make sure to hold the power button for 30 seconds beforehand.