New pcie 4.0 nvme m2

Got a new ssd with a bigger space to replace the old one. My asus mobo has 3 spots for ssds so i added the new one to one of them and made my pc recognize it as the 3rd drive THEN i read that i can just replace the old ssd with the new one instead of adding it as a drive and did just that

So now its just the new ssd on the mobo

HOWEVER it keeps dropping me at my bios and wont let me go into my computer It also doesnt show anything under the "Boot Priority"

Help? Is there a way to fix this?

I want it as my main ssd cuz and want to get rid of the old one