SSD Wont Boot after PC Rebuild

[avenirr]

Hi, this weird issue started happening and i can’t seem to fix it. I got a new pc case, so i took everything out carefully and rebuilt it into the o11 mini. Im really experienced with rebuilding my pc and i’ve done it multiple times. Anyways, now, windows won’t boot and after loading the MB logo, says select proper boot device and reboot. I have my main ssd that i used a few hours prior and i’ve always used as the main priority. It’s a 500gb samsung ssd that plugs into the motherboard m2 slot. I’ve tried everything. I have two other hdd each 1tb each that i’ve unplugged, tried reconnecting all my ssd and hdd components, reset bios, nothing works. I literally did nothing to the ssd as the whole time it was in the motherboard during the swap and wasn’t messed with. Any ideas?