PC switches on then off instantly, mobo LED stay on

sarangsujit02

Prominent
Feb 6, 2018
7
0
510
Well, I tried to assemble my first PC, and things are not looking good. The PC switches on then off in a split second, where the fans and LEDs work then switch off. The wierd thing is that my motherboard, Asus X370 Prime Am4, has its Red "style" LEDs on even after the PC shuts down.

The specs are:

Ryzen 1700x
Zotac GTX 1050ti, without psu power slot
8 GBs of HyperX DDR4 2400mhz RAM
Asus Prime X370 AM4 motherboard
Samsung 850 m.2 ssd
Seagate barracuda 2tb
CM Hyper 212X CPU Cooler
CoolerMaster MasterWatt Lite 500W PSU, 80Plus
4 LED case fans

The thing is I did encounter a few problems while installing the motherboards onto the standoffs, and all but one motherboard screw is used. Is there any chance of a short circuit. At first, I actually didn't install the CPU power from the PSU onto the motherboard when I first tried to power it up. I realised my mistake and fixed it, but the exact thing happebed again, where all the fans and LEDs powered up for a split-second then powered down, while the mobo's red LED strip was still on even afyer everything else powered down. Well I'm gonna test the PC outside the case the day after this is posted. Wish me luck.
 

sarangsujit02

Prominent
Feb 6, 2018
7
0
510


Well, I forgot to mention that only the case fans spinned when trying to power. So when breadboarding, none of the fans CPU cooler or GPU fan spinned but the Red led strip on the mobo stayed lit.

I tried a psu paperclip test and I found wierd behaviour from the psu. When trying to normally test it with the paperclip and nothing else, the psu fan just moves a TINY bit and nothing happens. But when I attach a molex connected case fans, both the PSU and case fan spins. I am really confused and worried.
 

sarangsujit02

Prominent
Feb 6, 2018
7
0
510


The PC does now work, with all the fans running. The Pc posted once, but i missed entering the bios. Now I'm trying to restart it over and over again, but there is no video output