[SOLVED] No Debug LEDs, pc won’t boot

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MathewYen

May 15, 2019
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I moved my system from one case to another, and now when I try to boot, no debug LEDs show up. Motherboard RGB is working, CPU cooler is working, GPU RGB is working.
Full specs:
i7-9700k
Asus Z390-F Gaming
Teamgroup Night Hawk RGB DDR4-3200 2x8
Cooler Master ml360r
MSI GeForce RTX 2080 Gaming X Trio
Adata XPG SX8200 Pro 512 GB
Corsair HX1000i
 
Solution
DMAN999
I would double check and make sure that the 24 and 8 pin cables are firmly connected to the motherboard and the PSU.
When I ugraded my PC to my current specs, it booted fine until I added some RGB strips.
It took me a while to figure out that I had bumped the 8 pin CPU cable when I installed the RGB strips.
The 8 pin cable looked like it was fully seated in the PSU but it wasn't.
Once I pushed it all the way back in my PC booted right up again.
Another thought is that the motherboard is possibly shorting to the case some how, possibly due to a stand slightly mis positioned or a screw dropped while making the case change, etc., etc.
I would pull everything out of the new case and test it on a wood table or a cardboard box to ensure...
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What exactly happens when you try to boot? Do the fans turn on? Have you tried shorting the power-on pins? Since you transferred to a new case, it could be that the power button isn't connect properly.
 
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I would double check and make sure that the 24 and 8 pin cables are firmly connected to the motherboard and the PSU.
When I ugraded my PC to my current specs, it booted fine until I added some RGB strips.
It took me a while to figure out that I had bumped the 8 pin CPU cable when I installed the RGB strips.
The 8 pin cable looked like it was fully seated in the PSU but it wasn't.
Once I pushed it all the way back in my PC booted right up again.
Another thought is that the motherboard is possibly shorting to the case some how, possibly due to a stand slightly mis positioned or a screw dropped while making the case change, etc., etc.
I would pull everything out of the new case and test it on a wood table or a cardboard box to ensure everything works with the case taken out of the equation.
 
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Solution
DMAN999 said:
I would double check and make sure that the 24 and 8 pin cables are firmly connected to the motherboard and the PSU.
When I ugraded my PC to my current specs, it booted fine until I added some RGB strips.
It took me a while to figure out that I had bumped the 8 pin CPU cable when I installed the RGB strips.
The 8 pin cable looked like it was fully seated in the PSU but it wasn't.
Once I pushed it all the way back in my PC booted right up again.
Click to expand...
DMAN999 said:
I would double check and make sure that the 24 and 8 pin cables are firmly connected to the motherboard and the PSU.
When I ugraded my PC to my current specs, it booted fine until I added some RGB strips.
It took me a while to figure out that I had bumped the 8 pin CPU cable when I installed the RGB strips.
The 8 pin cable looked like it was fully seated in the PSU but it wasn't.
Once I pushed it all the way back in my PC booted right up again.
Click to expand...
Thank goodness you sent this cuz I just tried a second supply outside of the system, and it worked, so I jumped to the conclusion that my PSU was bricked. Then I checked my 8 pin and realized that had come out somehow
 
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MathewYen said:
Thank goodness you sent this cuz I just tried a second supply outside of the system, and it worked, so I jumped to the conclusion that my PSU was bricked. Then I checked my 8 pin and realized that had come out somehow
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Kinda dumb that debug LEDs won’t come on without CPU power. Also, I had already checked my 24 pin assuming that the debug LEDs would come on as long as 24 pin was connected
 
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DMAN999 said:
Don't feel bad, I have been working on PCs since the late 80's and that loose 8 pin cable had me stumped for a few hours.
Click to expand...
Yeah the cable management in this case (Lian-Li O11 Air) had me struggling for a while because it’s not good with longer PSUs. Trying to put the cable management cover back on kept knocking out the Corsair Link Cable for my PSU monitoring, so I’m not sure why it didn’t occur to me that the 8-pin could come out too. Also the sideways mounting of the PSU means you can’t see all the cables at the same time.
 
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DMAN999 said:
Don't feel bad, I have been working on PCs since the late 80's and that loose 8 pin cable had me stumped for a few hours.
Click to expand...
Not feeling too bad, but laughing about the irony of this and a past PC building experience. My friend was building his first PC and couldn’t get it to boot. He video-called me and had me troubleshoot and I made some good-natured fun at him for not plugging in the 8-pin (on the motherboard side as he had a non-modular PSU). Now I’m laughing at myself for not plugging it in on the PSU side.
 
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