Hi, so I have been putting together a computer for my cousin and it wont post it just lights up for half a second then shuts off.It has•8th gen i5• msi z370 m5 gaming mobo• corsair vengenance ddr4 ram sticks •pny 970•thermal take 650 watt psu •and a cooler master coolerhttps://imgflip.com/gif/2oidveThat is exactly what it is doing whenever I try to start it. I've been trying to trouble shoot it with a different psu, changing ram slots, taking off the cooler to make sure it isn't shoorting, tried posting outside of the case, and taking out the GPU to see if it would make a difference to no avail. I've also checked all power connections are snuggly in place. And lastly I took the CPU out of the mobo to see if it would power on and it does, it doesn't give a pistol code which is expected with no CPU just thought this could be useful infoThank you for any help you can give