Computer not posting

[Cool_Beans_Yo]

Hello everyone, I am building a pc right now and I am having trouble getting it to post.

CPU: Ryzen 7 5800x

GPU: RTX 3070

MOBO: ROG STRIX B550-I gaming

RAM: Viper Steel DDR4 2X32GB 3600MHZ

Storage: Sabrent Rocket NVME 4.0 M.2 2TB

Power Supply: Corsair SF750

I built it outside of the case to make sure everything is working properly and its not posting. I have swapped out the GPU with one I had in another computer and it didn't do anything. I got the most up to date bios on a flashdrive and did the flashback process, which didn't do anything. After that I bought the same motherboard again to see if the motherboard was bricked and swapped the parts to it but still nothing. So I returned the second motherboard. I tried running it with only one stick of ram in and that also didn't do anything. I checked the CPU to see if there was a bent pin but as far as I could tell the CPU looked fine. I know the power supply is working because of the lights on the motherboard turn on. Does anyone have any ideas because I am really grasping at straws. 

[Quickstrike]

Did you put a heat sink on ?
That chip is going to to from 0 to 100 without the mass of a heat sink and you'll never post.

[Cool_Beans_Yo]

I just wanted to see if it give me a post, so I was going to turn it off after that sue to it being a bulky AIO. I feel the CPU with my finger after I hit the switch and it never warms up. Is it possible there is a firmware on the motherboard that prevents it from powering on without a cooler.

[Erioch]

I might be misremembering but aren't there some mobos that won't post without a fan plugged into the cpu_fan header?

[Cool_Beans_Yo]

I plugged a fan into the CPU fan header. It still didn't post and the fan didn't start up. I am starting to thing that I have a dead CPU.

[Quickstrike]

39 minutes ago, Cool_Beans_Yo said:

I just wanted to see if it give me a post, so I was going to turn it off after that sue to it being a bulky AIO. I feel the CPU with my finger after I hit the switch and it never warms up. Is it possible there is a firmware on the motherboard that prevents it from powering on without a cooler.

Nope, it would post.
Do you get any beeping? any light on the Mobo. It's seems to be an ROG. in that case you should have indicators during the post attempt.
 

[Fasauceome]

Do you have some spare ram you could borrow? Also try booting with less RAM

 

Do yourself a favor and don't keep testing the system with no CPU cooler. I know it's annoying to move a bulky cooler around but it's a lot more practical.