Issue with PC recieving power but not turning on

[frigid birch]

I am having an issue with my PC where I have got everything plugged in with a new motherboard CPU and RAM but for some reason it wont turn on. I can see lights showing on the motherboard so I know it is receiving power but just isnt responding to me pressing the power button on the case or the start button on the motherboard.

Attached is all of the power ports that I have connected on the motherboard as I understand that the 8-pin EPS under the 24pin ATX isnt necessary. I thought it was a BIOS issue because I have got a 7800X3D so I thought maybe the bios the motherboard ships doesnt support it so I manually updated the bios to the latest and I am still getting no response from the PC.

The motherboard I am using is the ASUS ROG Crosshair X670E Hero the CPU I am using is the 7800X3D and the RAM I am using is a 32GB kit of corsair vengence CL36 6000MHz

[frigid birch]

Would it be an issue with the front power switch?

becuase pressing start on the motherboard doesnt work either

[left hill]

Have you tried manually jumping the start pins?

Locate your motherboard’s power switch pins. They are typically marked as PWR SW or PC ON. If you can’t find them, it’s best to refer to your motherboard’s manual.
Once you’ve located the power switch pins, you need to short the negative and positive pins. You can do this by using a screwdriver or any metal object in a way that only touches the two pins and nothing else.

[frigid birch]

Funnily enough this was actually the last thing I tried

there was still no response from the motherboard or the PC

I really thought it was the BIOS issue but with the latest bios now installed I am still getting the same error

[left hill]

Is it getting the full power from the 24 pin connector and the CPU power connector? [need a PSU tester]

[sullen goblet]

Do the 7-segment displays above the start button show anything?

That is your boot code debug LEDs. Also do you see any smaller red or orange LEDs lit up anywhere on the board?

[frigid birch]

No the 7-seg displays are off so doesn’t show any error code and I don’t see any red or orange LEDs

I am thinking it might be an issue with the CPU

[mystic nest]

You should be able to get to BIOS without CPU, which should show something on the debug LEDs. If you're getting nothing at all then Id look for damage or try swapping PSU if you can

[crude patrol]

This is weird cause no way to not have the 7seg display running unless motherboard ded or psu ded

If u already tried re plug all cables at this point try diff psu if got extra or motherboard

[frigid birch]

Give me a second I will send some photos

I want to avoid for now switching out any compnents as I was hoping to fix this without having the drain the loop

[crude patrol]

Ohh u have it water cooled too i feel u

[frigid birch]

Yeah haha the PC is already delayed by like a week because there was a leak somewhere

[acoustic grove]

Did you do a dry run test before setting up the loop?

[frigid birch]

but I couldnt find it so I just ended up adding the coolent at the end and it isnt leaking at all

[acoustic grove]

In other words, did it ever work before now?

[frigid birch]

I dont want to run the pump dry but alot of the components are new like for example the motherboard the CPU and the RAM

The PSU I have had for a while and it is a reliable one

And worked before

[crude patrol]

Sadly man any droplet of water enough to kill anything on pc

I got the air pressure tool to check leaks

[acoustic grove]

1. You can do (you MUST do) a test boot without the pump running, just to make sure it boots, then turn it off once it posts
2. New hardware =/= working hardware. ALWAYS test boot your build before adding tubes/fluid

[frigid birch]

But in my leak testing I noticed about 0.1 Bar drop in about 30 minutes which after some research I found that it was likely to still be water tight

[acoustic grove]

Not always true. I've had water dump on graphics cards and seep into boards and they continued to work for years. Depends on the makeup of the liquid, where it landed, and how long you left it to dry

[frigid birch]

Wouldnt that cause the compnents to overheat with the CPU not being cooled at all?

[crude patrol]

Ohh yeah should be fine air pressure so much higher than water

[acoustic grove]

No, the metal mass from the waterblocks can soak enough heat for it to turn on. Don't boot into windows or anything, but it is essential to ensure it works before adding fluid

[crude patrol]

Is fine cpu designed to handle overheating not recommended but fine none the less

[acoustic grove]

It's the watercooling equivalent of leaving the side panel off until you see it boot

[frigid birch]

Ah shit yeah should have done that

But is there anything that I can do more now to test

[acoustic grove]

Consider this a lesson in watercooling best practices. It's happened to the best of us. Odds are you're going to need to drain the loop and rebuild the system outside the case so you can troubleshoot

[crude patrol]

Sadly no we want u to go bare minimum to test boot it at this point

No 7seg display is bad

[acoustic grove]

Hell, during a recent build I had a motherboard that was functional for years just randomly die when moving the computer to another case. I didn't do a test boot until it was filled up. Only then did I discover I needed to replace the motherboard

One of many reasons why I tell people not to do custom loops

[frigid birch]

Yeah so this is the PC at its current state the motherboard seems to be receiving power but the 7-seg isn’t on

[crude patrol]

Dem distro plate doe

[acoustic grove]

the seg screen will only turn on once it starts booting

[frigid birch]

Yeah and that’s the issue

It doesn’t enter its boot state

[crude patrol]

The good thing tho i see light so probably its not psu

[acoustic grove]

You're gonna have to put that motherboard on a cardboard box to test it open-air

That's what I'd tell anyone in this position

[frigid birch]

The PSU would be the easy one to swap out 🤣

[crude patrol]

Yeah feels bad man but that motherboard need to be out

[frigid birch]

But how would I test it then just plug in the 24 pin and the other power connectors and test it that way?

[acoustic grove]

yep

[frigid birch]

Could it be a CPU issue?

[crude patrol]

Well if u see 7seg display running thats a good thing

[acoustic grove]

Or, you could not listen to us and keep randomly guessing what it could be

[crude patrol]

Ur motherboard not even go to check cpu that happens after boot

[frigid birch]

I don’t see how taking it out to test will change anything though?

[acoustic grove]

Many reasons

Shall I go through them all?

You may have something lodged behind/around the motherboard that's shorting it

[frigid birch]

Ah so it should be booting into bios even without the CPU installed

[acoustic grove]

There may be something wrong with the mobo that you can't see while it's in the case

[crude patrol]

Haha yeah just trying to confirm nothing effecting it then we confirm motherboard ded

[acoustic grove]

Moving outside the case will isolate all variables that aren't the motherboard

[crude patrol]

At very least should show 00 iin 7seg

[frigid birch]

Fair enough

[acoustic grove]

Sometimes something's not setup right, and redoing it all outside the case "magically" fixes it

This is an extremely common troubleshooting step

[frigid birch]

Well I will try but I can imagine this is just a motherboard I will need to RMA

[acoustic grove]

It's all guesswork until you rebuild in open air

[frigid birch]

I can reuse the coolant right?

[acoustic grove]

Let us know when you've done that!

[frigid birch]

Yeah will take me most the evening though so it may be a while

[acoustic grove]

Such is life with custom loops