New build wont turn on! Psu or mobo issue?

JimmyNoPro · 11 Nov 2019 at 21:56

Hi.

I recently decided to put together a new gaming PC, I've reused a couple of parts from my old rig(GPU, SSD and CPU cooler) and everything else is new. I hooked everything up but it wont turn on, no fans spinning and no lights.

Spec is

I9 9900k
MSI Z390-A Pro
16GB Corsair Platinum Dominator RGB RAM 3600MHz
ASUS 8gb RX580
480GB SSD
Corsair RM850 psu
Coolermaster 212 evo cpu cooler
Seagate 1TB hdd(this isnt brand new but was never used and it wasnt in my old rig, I just had it spare)
Corsair 750D obsidian series case

Things I've tried

Checked the orientation of the front panel power switch connection to the motherboard.

Tried my old PSU, an EVGA 550w, same result, nothing turns on.

Double checked all connections to make sure they are secured properly.

Tried to turn on with just 1 stick of RAM, alternating each stick and slot.

My old psu and the gpu definitely work fine. My old rig still has a mobo, 8gb of ram and the cpu(with no cooler) in it that I could use as a test rig if needed. Not sure if I'd need to move parts back or not.

I'm not sure what to try next, any help would be greatly appreciated.

Thanks

snips86x · 11 Nov 2019 at 22:05

Sounds like it's shorting on the case. Build it on the motherboard box and see if it changes things.

JimmyNoPro · 11 Nov 2019 at 22:12

I'll give that a shot and see what happens. Will have to wait till to the morning though. Thanks for the quick reply!

Drumroll · 11 Nov 2019 at 22:37

You can try the paperclip to check if the PSU is working.
Or check all connections, as the CPU power cable, which is the one I often forget to connect as stays almost covered by the top radiator.

Yrkoon · 11 Nov 2019 at 22:40

had something very similar many moons ago, turned out we had a screw sitting under the agp slot, yeh very many moons ago

yep as mr potato says check the cpu power is plugged in the mainboard

have you turned on the psu switch at the back or tried a different lead?

FlyingScotsman · 12 Nov 2019 at 08:59

Yrkoon said:
had something very similar many moons ago, turned out we had a screw sitting under the agp slot, yeh very many moons ago

yep as mr potato says check the cpu power is plugged in the mainboard

have you turned on the psu switch at the back or tried a different lead?

Ahh AGP now theres a blast from the past

JimmyNoPro · 12 Nov 2019 at 16:55

snips86x said:
Sounds like it's shorting on the case. Build it on the motherboard box and see if it changes things.

Built it outside the case on the box, same results. No fans come on and no lights.

Yrkoon said:
had something very similar many moons ago, turned out we had a screw sitting under the agp slot, yeh very many moons ago

yep as mr potato says check the cpu power is plugged in the mainboard

have you turned on the psu switch at the back or tried a different lead?

Have tried a different lead and also double checked all connections, including the cpu one.

I've not done the paperclip test on my new psu, my old and working psu is giving me the same results, no lights or fans coming on. I dont think the psu is where the issue lies. Could the mobo be dead?

Any other suggestions?

Thanks

FlyingScotsman · 12 Nov 2019 at 17:08

Could be the motherboard or the CPU, if you have tried another PSU.
What about taking the CPU out and checking for bent pins etc and reseat the CPU?
Worth a try.

JimmyNoPro · 12 Nov 2019 at 17:40

I'll try it. Thanks

JimmyNoPro · 12 Nov 2019 at 18:44

FlyingScotsman said:
Could be the motherboard or the CPU, if you have tried another PSU.
What about taking the CPU out and checking for bent pins etc and reseat the CPU?
Worth a try.

Same result, not turning on, no lights or fans spinning. The cpu looked fine, no bent pins or signs of dmg.

When I had everything off I checked the BIOS battery on the suggestion of a friend, he thought there may have been a plastic tab to remove, there wasn't.

I also tried different power cables for the cpu and for the mobo, still nothing.

Really think my mobo is DOA, not sure what else I can try. I'm open to any further suggestions.

Thank you all for the help, it's really appreciated

FlyingScotsman · 13 Nov 2019 at 06:46

JimmyNoPro said:
Same result, not turning on, no lights or fans spinning. The cpu looked fine, no bent pins or signs of dmg.

When I had everything off I checked the BIOS battery on the suggestion of a friend, he thought there may have been a plastic tab to remove, there wasn't.

I also tried different power cables for the cpu and for the mobo, still nothing.

Really think my mobo is DOA, not sure what else I can try. I'm open to any further suggestions.

Thank you all for the help, it's really appreciated

Yeah does sound like your mobo, won't be the first time I have had a DOA motherboard brand new either, think I have had 3 over the years.
Good luck with the RMA

Drumroll · 13 Nov 2019 at 07:47

FlyingScotsman said:
Yeah does sound like your mobo, won't be the first time I have had a DOA motherboard brand new either, think I have had 3 over the years.
Good luck with the RMA

Had one when decide going for the most expensive Gigabyte available at the time, about 10 odd years ago. Frustrated.

FlyingScotsman · 13 Nov 2019 at 08:55

MrPotato said:
Had one when decide going for the most expensive Gigabyte available at the time, about 10 odd years ago. Frustrated.

My Asus-X99-Strix board was DOA from overclockers, but was replaced no issues.
But you always think its something you did when installing it. :rolleyes: