Mobo not turning on with new PSU

[GD 2W10]

Hello,

 

I am trying to build a PC.This is my build list (I got a different GPU, but it’s still an RTX 4070) https://newegg.io/8f3ca36

I realized that the power supply (750 W) enough as my GPU wouldn’t work. I got this new 1200 W power supply: https://www.amazon.com/dp/B0C1JKK1YZ/ref=cm_sw_r_cp_apip_gT6CYj3Y6f6Iq

When I try to turn on everything, nothing happens. Usually with my old PSU the logo would glow up, but nothing happens. I am sure everything is connected. What should I do?

Edited January 14 by GD 2W10

[D.Draker]

How to Test a Power Supply Using a Power Supply Tester

https://www.lifewire.com/test-a-power-supply-using-a-power-supply-tester-2626160

[D.Draker]

There's another method for old schoolers, but maybe dangerous for others, it tests PSU with an electric bulb as its load. I shall not write it here, I'm not gonna be responsible if someone electrocutes himself. But it can be found on the internet, I like this method and always use it. I also test any PSU for the real protections it has (I don't trust whether they claim it to have them), so I short the pins and watch if it goes kaboom, if it's a good one - the short will lead to the PSU just going off.

Edit: Again, it's dangerous for inexperienced users.

 

Edited January 14 by D.Draker
dangerous

[D.Draker]

And obviously it needs to be a classic bulb, not the diode ones they shove our throats at every store.

Like this one. 100W is good enough.

 

[D.Draker]

8 hours ago, GD 2W10 said:

RTX 4090 https://newegg.io/8f3ca36

I realized that the power supply (750 W) enough as my GPU wouldn’t work. I got this new 1200 W power supply

In this case the actual power capabilities of the PSU doesn't matter for the PC to just turn on. Full load under heavy gaming is another matter. 

[jaclaz]

Well, the good ol' method was to use a car tail lamp, double filament, 5/21 Watt @12V.

The 21 W on the 12 V rail, the 5W on the 5 V one.

On older PSU's you had to have some load on both  rails.

 

 

[Dixel]

On 1/14/2024 at 4:49 AM, jaclaz said:

The 21 W on the 12 V rail, the 5W on the 5 V one.

While 5W is perfectly fine for standby, 21W on the high load 12v rail seems too low to test a 1200W PSU, especially considering the fact the modern ones have 12v single rail.