Home build woes

[DIW35]

I have just put together a new build, but it is not powering on. LED on the motherboard illuminates as soon as the PSU is switched on. Upon pressing the power switch on the front panel, the cooling fans start to spin and an LED on the GPU lights briefly, but almost immediately there is a click and the fans stop and the GPU LED goes out.

The motherboard LED stays on, but further presses of the front panel power switch does nothing, unless the PSU is turned off and back on again. It seems like something is resetting, but I have no idea what could be causing it so am looking for ideas.

The build comprises:

ASUS ROG STRIX X870E motherboard
AMD Ryzen 7 9800X3D AM5 CPU
32GB DDR5 memory
4TB Samsung 990 PRO drive
Radeon RX 9070 XT GPU
MSI Coreliquid E240 AIO cooler
ASUS TUF Gaming Gold 850W PSU

Initially I thought that I may have under-specced the PSU, so took the GPU out but that didn't change anything. Unless there are some switches on the motherboard that I need to configure, I am currently at a loss on how toproceed.

[Liszt]

What is the Q code on the display showing?
There is a table in the manual

Where did you get your parts from? I built a system recently with a CPU from Amazon that was DOA.

[DIW35]

Nothing showing on the small display. The fans and GPU LED are only active for a fraction of a second before quitting. The disp[lay doesn't light up at all.

All parts are from Scan computers. I've used them before and never had a problem.

Edited by DIW35 on Monday 1st September 19:29

[trebnamo]

Could be RAM, Ryzen boards can be very choosy about the memory they'll work with. You could check the RAM you've bought is listed on this page:

https://rog.asus.com/motherboards/rog-strix/rog-st...

It's worth confirming manufacturer and model number are on the QVL.

If it is, and the RAM is across multiple modules, you could try removing all but one module and try it in different slots as well.

[WrekinCrew]

Any beeps? If none fit a motherboard speaker and check for anything other than a single beep.

[DIW35]

trebnamo said:

Could be RAM, Ryzen boards can be very choosy about the memory they'll work with. You could check the RAM you've bought is listed on this page:

https://rog.asus.com/motherboards/rog-strix/rog-st...

It's worth confirming manufacturer and model number are on the QVL.

If it is, and the RAM is across multiple modules, you could try removing all but one module and try it in different slots as well.

That page is listing a load of stuff that is going right over my head. Having entered the details of the RAM I have got, I'm none the wiser as to whether it's OK or not. I may ring SCAN tomorrow and ask their advice. I figure they should know if the stuff they are selling is compatible.

[Griffith4ever]

DIW35 said:

Nothing showing on the small display. The fans and GPU LED are only active for a fraction of a second before quitting. The disp[lay doesn't light up at all.

All parts are from Scan computers. I've used them before and never had a problem.

Edited by DIW35 on Monday 1st September 19:29

I used to build PCs in a shop and coming across a faulty Mobo , CPU, or Memory, is not that uncommon regardless of supplier. Well, it IS uncommon, but it happens.

I'd start by reseating CPU , memory and GPU. Something fundamental is not right to give you your symptoms. Might even be the PSU! Though unlikely. Sounds like its failing at the POST stage.

Frustratingly, if the above doesn't help you are at the replace one by one stage, starting with the Mobo. Or, send it all back and start again.

[phil4]

Usual approach to those sort of things, is start at the basics.

Pop CPU, memory and motherboard in, connect power and see if it works.

If it does, then start fitting other parts like drives, and GPU... then give it another whirl.

If Ok, fit it in the case.

[Liszt]

Griffith4ever said:

I used to build PCs in a shop and coming across a faulty Mobo , CPU, or Memory, is not that uncommon regardless of supplier. Well, it IS uncommon, but it happens.

I'd start by reseating CPU , memory and GPU. Something fundamental is not right to give you your symptoms. Might even be the PSU! Though unlikely. Sounds like its failing at the POST stage.

Frustratingly, if the above doesn't help you are at the replace one by one stage, starting with the Mobo. Or, send it all back and start again.

This. Although I have found Scan to be better than Amazon! You pays your money....

I would start with just mobo, psu and CPU+cooler, to see if you can get to post. Rules out the memory and GPU at this stage.

I had to go through the ball ache of swapping mobo then PSU then the chip to find out it was the chip on my last build.

[DIW35]

Thanks for all the suggestions guys. As I had bought components to build 2 PCs it was a fairly straight forward job to initially try swapping parts out to see if I could find a dodgy component. This didn't throw anything up so then I just started assembling the parts, testing as I added each one.

I was able to replicate the problem when I plugged in the SATA drives. Turns out the power cable was dodgy and was tripping the PSU. A different cable and problem solved.

[Liszt]

DIW35 said:

Thanks for all the suggestions guys. As I had bought components to build 2 PCs it was a fairly straight forward job to initially try swapping parts out to see if I could find a dodgy component. This didn't throw anything up so then I just started assembling the parts, testing as I added each one.

I was able to replicate the problem when I plugged in the SATA drives. Turns out the power cable was dodgy and was tripping the PSU. A different cable and problem solved.

And a big sigh of relief, I imagine

[DIW35]

Liszt said:

And a big sigh of relief, I imagine

Definitely. It's just a pain that I had to dismantle everything to check parts one at a time, and now have to put it all back together again.

[Griffith4ever]

Result!

[Digger]

Well done & that's an unusual issue!

Who manufactures the PSU or the cable so I know who to sidestep in the future