Xbox One X turns on then off after 5 seconds

Hi! I have a xbox one x and ever since I replaced my thermal pads and paste it tirns on then off after 5 seconds. Ive tried: replacing thermal paste again, new fan, new power supply, new ssd. I ordered a thermal pad off of amazon and as I was waiting for it to be delivered I decided to switch out the hard drive with a ssd. It booted up to the offline update page which it is supposed to after a ssd chang. When the order arrived, I changed that. Now the issue occurs and wont stay on. Ive checked everything seeing if the motherboard has any damage or something isnt plugged in. Thanks everyone for your help!!