Question I changed my motherboard and CPU at the same time, now getting no video input on monitor ?

[dnnrn]

I bought a gigabyte b450m ds3h v2 and ryzen 5 3600. My PSU is CV450. The bios appeared once but then it turns back to "no video input". When I try to push the off button on the case, the led light from the motherboard just flickers but it doesn’t turn the PC off.

 

[helpstar]

which GPU did you install?

 

[dnnrn]

which GPU did you install?

gigabyte rx 580. i tried to turn it on without the gpu, and just through the mobo, but it also says no video input

 

[helpstar]

without the GPU it will always say no video, because the CPU doesn´t provide an integrated video chip. So the mobo video outputs can´t work.

did you connect all power connections? to the GPU as well?

 

[dnnrn]

without the GPU it will always say no video, because the CPU doesn´t provide an integrated video chip. So the mobo video outputs can´t work.

did you connect all power connections? to the GPU as well?

yes, it’s all connected. i checked it just now. when i try to turn the pc off, the led from the motherboard just flickers but it doesn’t turn off. can it be because of the psu?

 

[helpstar]

could be it, yes

 

[dnnrn]

could be it, yes

okay, thank you! i’ll try changing my psu. but one last question, is 450W too low for a b450m ds3h v2, ryzen 5 3600, rx 580 8gb, 2x8gb 3200MHz with 2 ssd and 1 hdd?

 

[CountMike]

okay, thank you! i’ll try changing my psu. but one last question, is 450W too low for a b450m ds3h v2, ryzen 5 3600, rx 580 8gb, 2x8gb 3200MHz with 2 ssd and 1 hdd?

Rx 580 8gb, alone can take up to 185W, CPU 65W and rest about that much. Real PSU sustained power is about 3/4 of it's rated power so yeah , 450W is at edge.