Question Need help troubleshooting pc

[Lego chainsaw]

when I turn my pc on it stays on for about 3 seconds then turns back off, if I take the gpu out the pc stays on but there’s no display from the motherboard.

what could be causing this?

 

[hotaru.hino]

What's the full specs of your computer?

 

[Lego chainsaw]

What's the full specs of your computer?

Ryzen 3 3200g
Msi b450 tomahawk
R9 270x
2tb hard drive 250gb ssd

 

[punkncat]

Try to reset CMOS and restart without the graphics card installed.

What is the make and model of your power supply? How old is it?

 

[Lego chainsaw]

Try to reset CMOS and restart without the graphics card installed.

What is the make and model of your power supply? How old is it?

Resetting cmos didn’t work.

Evga 600 br, about 3 weeks old

 

[punkncat]

Has this system been working as is previously, or built and never worked?

 

[Lego chainsaw]

Has this system been working as is previously, or built and never worked?

it started doing this today but was working fine last night