New build, starts up then shuts down immediately

Big Frank · 2 Aug 2018 at 13:03

Hi guys, I built a new system yesterday and after reading through all the documentation and grind I finally go to turn it on and the cpu fan and rear LED fan start spinning for half a second then the system goes off immediately.

Here is a list of things I have tried...

Removing the I/O shield as I thought it might have been rubbing and a short.

Removed the RAM and tried powering it on with 2 different 8gb sticks 1 at a time.

Used the power supply from this computer I am using now to rule out a power supply issue.

Had a look round the CPU to make sure no thermal paste had leaked into the socket.

Checked that all the cables were plugged in properly.

Double checked that there were no extra risers behind the motherboard which could cause a short.

Stripped the computer down to make sure the cabling around the case has no wires that are exposed which could cause a short and that there are no loose screws or other metal objects touching the motherboard.

Double checked that the motherboard supports 8th gen Intel processors which it does.

I have exhausted a lot of options and have just tore the whole thing down and re-boxed everything and I am thinking about getting a replacement motherboard but I just want to know if anyone has any suggestions or experience with this type of thing.

System build

Intel i5 8500
ASUS Prime z370-p
2 x 8GB Corsair Vengeance LPX DDR4 2400Mhz
Corsair VS 550 PSU
Kingston 240GB SSD
1TB Western Digital HDD

rhysduck · 2 Aug 2018 at 13:10

Have you checked the CPU socket on the motherboard for bent pins?

Have you built the system on top of the motherboard box with just the bare essentials? CPU, CPU Cooler, 1stick of RAM, PSU

orbitalwalsh · 2 Aug 2018 at 13:13

plugged 4/8 pin power connector to top of the board? normally left hand side- most just plug in the 24 pin

Big Frank · 2 Aug 2018 at 13:16

I havent built it ontop of the motherboard box with just those things. I would need to jump the power pins on the mainboard to start it wouldn't i? If it done the same thing it would rule out the case being the issue?

Big Frank · 2 Aug 2018 at 13:18

orbitalwalsh said:
plugged 4/8 pin power connector to top of the board? normally left hand side- most just plug in the 24 pin

Yeah I plugged in the 8 pin CPU power cable. I'm thinking its either the motherboard or CPU I just don't know how to figure out if its one or the other.

orbitalwalsh · 2 Aug 2018 at 13:21

Big Frank said:
Yeah I plugged in the 8 pin CPU power cable. I'm thinking its either the motherboard or CPU I just don't know how to figure out if its one or the other.

taken out and reseated CPU? could be upside down.... and i do this about once a month haha

Big Frank · 2 Aug 2018 at 13:24

orbitalwalsh said:
taken out and reseated CPU? could be upside down.... and i do this about once a month haha

I took it out to check the socket to make sure there was no thermal paste in it, the CPU socket has small round grooves at one side to make sure it can't go in any other way unless you put it in upside down lol

orbitalwalsh · 2 Aug 2018 at 13:32

Big Frank said:
I took it out to check the socket to make sure there was no thermal paste in it, the CPU socket has small round grooves at one side to make sure it can't go in any other way unless you put it in upside down lol

... yep.. thats me , few times ive done that hahaha

as mentioned above, last attempt is to build out of case

Big Frank · 2 Aug 2018 at 13:35

orbitalwalsh said:
... yep.. thats me , few times ive done that hahaha

as mentioned above, last attempt is to build out of case

Assuming that fails which im sure it will what do you reckon...CPU or mobo?

orbitalwalsh · 2 Aug 2018 at 13:52

no idea, if your got it from ocuk, should be able to rma both and they can test them both

Big Frank · 2 Aug 2018 at 14:10

orbitalwalsh said:
no idea, if your got it from ocuk, should be able to rma both and they can test them both

I got the mainboard from amazon althought I got the processor from overclockers.

Big Frank · 2 Aug 2018 at 14:11

orbitalwalsh said:
... yep.. thats me , few times ive done that hahaha

as mentioned above, last attempt is to build out of case

Just tried that, expected the best tbh but I can officially rule out the case, the problem still exists.

orbitalwalsh · 2 Aug 2018 at 14:11

Big Frank said:
I got the mainboard from amazon althought I got the processor from overclockers.

the pain going with two different shops and board vendor cant send board direct to . Personally don think its your CPU

Big Frank · 2 Aug 2018 at 14:16

orbitalwalsh said:
the pain going with two different shops and board vendor cant send board direct to . Personally don think its your CPU

The motherboard lights up when the powers plugged in which gives you a false sense of hope but it could be another circuit on it that's humped. Im going to send the board back to amazon. If anyone has anything else i'd be happy to give it a go up before I send the board back.

Vinno · 2 Aug 2018 at 14:17

I had this issue once and I *THINK* it was when my water cooling leaked and took out the GPU and motherboard - so imo its the motherboard. Obviously not water damaged in this case but maybe some other defect or damage.

Big Frank · 2 Aug 2018 at 14:20

Vinno said:
I had this issue once and I *THINK* it was when my water cooling leaked and took out the GPU and motherboard - so imo its the motherboard. Obviously not water damaged in this case but maybe some other defect or damage.

Yeah I don't have any water cooling just a stock cooler and I have been handling it like a new born baby so I know its not through me being negligent.

orbitalwalsh · 2 Aug 2018 at 14:21

if under 14 days, should just be straight swap

Big Frank · 2 Aug 2018 at 14:37

orbitalwalsh said:
if under 14 days, should just be straight swap

Yeah amazon are giving me a free replacement, just off to the post office now to send this back.

orbitalwalsh · 2 Aug 2018 at 14:38

Big Frank said:
Yeah amazon are giving me a free replacement, just off to the post office now to send this back.

nice!

Big Frank · 2 Aug 2018 at 15:48

I want to thank you all for your help and I will update this thread when I receive my new mobo.