Need help with motherboard problem

[Djan1999]

So yesterday I bought components for new build. Everything went fine I put everything yogethet and before putting in gpu and pluging it to monitor and all i tryed test boot to see if everything works and i get normal boot fans turn on and everything and all looked good so i turned it off with PSU button and proceded to manage cables in back panel. After I did that i tryed to boot again but nothing happaned. No beep, no fans spin or anything like its dead. So I tested PSU by connecting green and black wire to see if psu works and it seems to work fine so its not problem with PSU. Tryed taking whole motherboard apart and back together but still 0 signs of life. I get 0 lights or anything on motherboard like its dead or fried. PLEASE Help cus idk what is wrong!

[phillpower2]

Welcome to PCHF Djan1999,

Have you checked that the power on button on the case connection to the MB has not come loose/disconnected.

Can you post the brand and model name or number for the case, MB, the RAM )including the amount) add on video card if one is used and the PSU (power supply unit) providing these details will enable us to better assist you.

[Djan1999]

Im using:
B450M bazooka plus
Hyper X predator 2x4gb 3000mhz
Ryzen 5 2600
Asus strix Gtx 1060 6gb
Corsaie CX450 non modular

I checked cables and everything even tryed turning it on with screwdriver on pins but 0 response no spinning fans no nothing

[phillpower2]

Best couple of suggestions I can make would be first remove the MB and do a barebones set-up on a piece of cardboard (make sure it is larger than the MB) only connect the PSU and the keyboard.

IF your MB doesn`t have a power test switch you will then need to short out the 2 power on pins on the MB header to get the PSU to activate, you can use a small flat bladed screwdriver or a paper clip bent into a U shape, this is perfectly safe if you do not touch anything else, the idea is to see if we can get a BIOS screen if you do you can then add one component at a time until you find the problem component, [COLOR=rgb(184, 49, 47)]you must power down and remove the power cord from the wall before adding another component, second suggestion try a known working PSU, it is not unknown for new components to be bad,[/COLOR]

[Djan1999]

Also forgot to say: When I have gpu in there and pluged on there is white led light whic indicates PSU is 100% not the problem. Also alredy tryed turning motherbord on with just CPU, 1 Ram stick and Ryzen stock cpu cooler but It showed no signs of life no spin on cooler or anything. And i did use the screwdriver trick on pins to turn mb on but nothing

[phillpower2]

Try it with nothing in the MB other than the CPU, just in case the memory slot/s are shorting out, the MB must as was suggested be set-up on a piece of cardboard outside of the case, something inside of the case could have caused a short, the backplate/I/O plate, a trapped pt bared wire etc

From your OP;

i turned it off with PSU button and proceded to manage cables in back panel.

Before touching the MB etc did you disconnect the PSU from the wall socket, press the case power on button for 20 or so seconds to get rid of any residual charge in the system and ground yourself on the chassis or PSU to get rid of any static in your body, failure to do any one of these could have shorted out the MB,

[Djan1999]

No i left psu connected to the wall just turned it off on the button at the back of PSU.
I just tested psu again with green to black wire and it works perfectly fine but when I connect it to MB and try to turn it on through MB pins I get no response. Im guessing I somehow fryed the MB? I also did test with just CPU and nothing else but 0 response no light on MB no nothing.

[Djan1999]

Does my warenty work on shorted out MB and also is there a way for me to fix it my self?

[phillpower2]

I also did test with just CPU and nothing else but 0 response no light on MB no nothing.

Was this outside of the case on a large piece of cardboard, you should inspect the caps on the MB to see if any are blown or leaking, see info here

No warranty will cover any item of hardware that has been damaged by a short circuit, there is no fix I`m afraid

[Djan1999]

I checked those but all seem to be fine it just dosent get any power or something as it seems. Well il still try my luck with it and play dum as not knowing what happaned. Alredy ordered new MB (B450M Mortar). And yes I did do it on cardboard.

[phillpower2]

Does sound like the board is dead then, the only other thing that could cause it is if the CPU was shorting out but this apparently ruled out by the fact that you did have the system up and dunning for a while.

I hope you have better luck with the replacement board and can I suggest that you do the suggested bare-bones set up before placing the replacement board in the chassis.

[Djan1999]

Is there a way to test if cpu is damaged or any visual signs? Just to make sure its MB but yes I did have it runing and all for like 30s before I turned it off. It is possible it short circuted on one off standoffs under the heatsink of bios chip so it could have shorted there maybe.

[phillpower2]

Is there a way to test if cpu is damaged or any visual signs?

Only test is placing the CPU in a known good, compatible MB and checking the CPU for any bent or missing pins + if you used thermal compound and there was too much of that it can cause a short.

t is possible it short circuted on one off standoffs under the heatsink of bios chip so it could have shorted there maybe.

It would have shorted out and shut down before you had a chance to shut it down yourself so not likely.

[Djan1999]

I used preapplied thermal compound on cooler so it defenetly wasnt that and also checked pins many times and they all seem to be there and as they should be so cpu is probably fine. I just rly wonder what caused MB to get shortouted because there are not visual damages on caps or anywhere at all.

[phillpower2]

Any update for us?