This is my humble sugestion to any of you having BIOS issues, I hope you find the solution for longer than normal boot time here:
Clear CMOS. but, first ,Cut the power to PC and, (using motherboard manual as needed) Find CMOS pins and remove the Battery from motherboard to clear CMOS and then pull DDR5 sticks and , like someone already suggested on a post, clean the contacts, and make sure you are installing your memory sticks where they are suppose to be on the motherboard's DIMM RAM slots, pls read motherboard's manual.
I made the mistake, that remids me that AM5 is not longer AM4 DRR4 setup style. After that check inside your case and make sure all plugs and fans and RGB headers have been installed as they should be installed according to their configuration. Dual channel DDR5 sticks and if you are using one or two pairs of identical DDR5 sticks of RAM, have yourself good lighting and magnifiying glass if needed so you accidentally don't change the polarity on a FAN or RGB header, leading to an angry as hell capacitor, which in turn will seek revench by slowing down Bios boot time.
So be sure all connections are correct. then Turn power on to the computer and don't let it boot to windows ever until your boot time is some like 5 secs before starts loadding windows.. This was the hard part for me since x670e motherboard requires a DDR5 trainning time which is quite long time such as: AsRock x670e pro rs , ENTER BIOS settings. And reboot after setting in BIOS to ( load the DEFAULTS) settings. Do not let PC boot to windows yet and Enter into Bios again. This time, follow your motherboard's Bios manual and set your XMP or AMD EXPO.
My pick from AMD EXPO mode and speed preset modes.
With my G.Skill Trident Z5 @6000mhz cl- 30 x(32x2) / 64gb AMD RYZEN 9 7900x ( AMD ECO mode 65w) and preset mode: PBO tjmax 75°c and -20 for the Curve Optimizer.
Boot time 17 ~20 seconds all the way into windows 11 desktop ready to execute whataver I want or please to do. Aida64 tested and also Cinebench among others. Not a crash, BSOD,hucups or low performance issues at all.
So if you are still not lucky afterwards, that motherboard BIOS is not set properly or you need to RMA yours. Because it must be able to get out from Bios checkup to start windows system in about 5 secs at most. So make sure you have it running that fast before even trying loadding windows OS.
My board has a BIOS FLASH usb port specific for flashing the BIOS. Try not to use that USB slot ( mine has it on the rear) if your motherboard has one, nothing should be plugged to it, unless you're Flashing your X670e Bios thru that USB port. AM5 motherboards are indeed very fast and powerfull boards. But very sensitive to our bad tweaks (human mistakes). I'm glad that I made the upgrade from AM4 to AM5. Ryzen 7000 CPU's are awsome, packed with nasty power, but thirsty for watts. A M D has engineered the best chip ever. A monster chip that needs to be carefully tweaked for it'S tru performance.
At least mine is running nice at confortable temps. The way I want it to be.
