New build won't boot

Sixense

Sixense

Sixense

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28 Aug 2014
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Lancs
Hi, as per title, built a brand new rig for a mate, parts bought here, and it simply won't boot at all.

Ryzen 7900x, Kingston Fury Beast 32 GB DDR5, GB Aorus Elite X670 AM5 mobo, Seasonic Prime GX 850 PSU, EK AIO 280 D-RGB, Phanteks Eclipse P500 case, Crucial P3 Plus nvme ssd, Sapphire RX 6800XT Nitro+.

That's the specs, connected everything besides a single eLoop fan as rear exhaust, didn't boot, so we went trial and error after that.

Jumper trick set front fans LED alight, so figured PSU is fine. Took out and unplugged everything except CPU, cooler and a single ram stick, no go. Tried another stick, no go. Mate's dad checked 24 and both 8pin cables with a voltmeter to rule out faulty cables.
When PSU is off, plugging the 24 pin into mobo the CPU cooler fan LEDs blink once with bright green-ish light, that's about all the signs of life coming from PC.

I have reset the cmos just in case, no go. Tried turning it on both using from panel, and switch on mobo, no signs of life.

What our next steps would be, I guess mobo is DOA?
 
There was no sign of life from pc, cpu cooler didn't spin, no LED on pump, nothing. Think i should ask him to turn it on and leave for like 10 min?

Edit: gpu fans or led didn't come to life either
 
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Sixense said:
There was no sign of life from pc, cpu cooler didn't spin, no LED on pump, nothing. Think i should ask him to turn it on and leave for like 10 min?

Edit: gpu fans or led didn't come to life either
Click to expand...

If no life whatsoever, then I would guess motherboard or PSU, but the gpu and pump leds would be on even without the board being functional, would they not? (Edit: ...actually that would depend where they get their power from) That suggests the PSU is more likely to be at fault to me, or there's a short. Probably a silly question, but the original PSU cables are being used, right (not third party or from another PSU)?

Could you take a pic?
 
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You might want to retry rebuilding the system outside the case to rule out a short from something from the case itself (which can also do something like this). This should quickly tell you whether it's the case (or something in it) that's shorting the system and preventing it from booting, or the PSU/motherboard that's at fault.

For example, I recently found out (when rebuilding an old Windows 98 setup into) that my Corsair 650D of 10+ years actually has a short on the front USB cables leading to the front of the case and if they're connected to the motherboard it will either work but be really buggy (constantly disconnecting, etc), or wouldn't boot up at all, no signs of life at all (thinking back over it, it might actually be the reason why I can feel the electricity on the case as I ran my hand over the case sides, always thought it was weird, now it makes total sense... Oh well, too late now to save that dead system...). Anyway, finding that issue allowed me to resolve the issue (for this old Win 98 setup) by putting tape over the offending USB male plugs and leave them alone inside the case hanging somewhere where they can never touch anything (case or parts inside).

Also, as @Tetras asked, you did use the original PSU cables, correct?
 
Tetras said:
If no life whatsoever, then I would guess motherboard or PSU, but the gpu and pump leds would be on even without the board being functional, would they not? (Edit: ...actually that would depend where they get their power from) That suggests the PSU is more likely to be at fault to me, or there's a short. Probably a silly question, but the original PSU cables are being used, right (not third party or from another PSU)?

Could you take a pic?
Click to expand...
Pic not possible at the moment, but yes, using original Seasonic cables that came in the box. If there's enough time before work tomorrow I'll rebuild system out of the case, if it's still dead, anyways will be easier to check cpu pins with it outside.

Question: after checking the cables with a voltmeter, mate's dad tried checking the psu with it, and couldn't get anything off the sockets in it, yet while doing jumper test the front fan LEDs turned on, is that possible if psu was dead?
 
Such a high end system deserves a healthy boot!
I would re-seat all connections cables Ram card etc.
U may be able to boot without gpu as new ryzen chips have onboard graphics.
 
So, um, update. Took cpu off, pins were perfect, reapplied paste, put everything back together, BOOM works *shrug. Probably wasn't sat right in the socket. Thanks for everyone's input :)
 
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