[SOLVED] RGB, fans and system starting but no POST. White LED ?

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texmex69

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Apr 30, 2014
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I've been having issues with getting my computer to POST for about a month. It seems like I've tried everything, so I'm posting here to see if it's something obvious I'm missing. I'll try to give as much information as I have in this post, some of it might not be relevant. Computer was built a year ago.

So as the title suggest when I press the power button all the RGB work and fans start spinning, BUT with a white debug LED. The RGB turning on is, Motherboard, CPU fan, RAM sticks, GPU and fans. ALL the fans are working, but while the RGB on the GPU works the fans are not spinning. I'll post a picture at the bottom of the post for reference.

SPECS:
Ryzen 7 3700x
ROG B450-f Gaming
Asus RTX 3070 Dual OC (bought in January)
2x 16gb Trident Z neo 3600mhz CL16
Samsung 970 evo plus
Corsair RM650x

For troubleshooting I've tried the following with no luck:
Cleaned PCIE lane and reseated GPU
Tried a different GPU (GTX 1060)
Reseated and booted with one RAM stick (tried both of them)
Secure all the PSU cables to the motherboard
Checked the standoffs
Unplugged power, holding the power button down, removed CMOS battery
Reset CMOS(?) jumper with a screwdriver
Inspected the CPU for physical damage (looks good)
Tried different inputs (HDMI, DP)
Tried four different monitors (same thing, no signal detected)

I'll try to give a description of the situation which made my system unable to post.
Firstly a situation that was weird, but not the one breaking the system; I moved and was driving with the computer in the back, GPU was out and I had bubble wrap in the system. This was a 20-hour drive. When I wanted to boot up the system again, I got the same issue I have now. Fans spinning and everything, but no post. I just restarted my PC a couple of times and it posted, which worked fine for about a month.
THEN I bought a new monitor, and when I originally plugged it in the same issue. This time I had to take the GPU out and back in again, and it worked. But after a 4 hour gaming session I opened Chrome and immidieatly got a blue screen. This was the last time the system posted.
Since then I've been troubleshooting and pulling my hair out, hence this post.

I hope someone can help me out on this.

PICTURE;
https://imgur.com/a/GXluJVE
View: https://imgur.com/a/GXluJVE
 
Solution
Vic 40
Tried the second pcie x16 slot as well? Maybe even look at how pcie 3.0/2.0 is set in the bios, maybe need to really set it to 3.0 for the first/top slot or maybe even test the first/top slot truly set to 2.0.
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Vic 40 said:
The white led points at VGA ,

see you are using one pcie cable on the 3070 test with two cables each one connector. Make sure pcie cable is well slotted at both ends so psu side as well.

The colored cables are xtensions or cable mod kind of cables? Tested with the original as well?
Click to expand...

Thanks for your reply!

The pcie cable is well seated in the PSU, might be the whole cable that's causing issues?

The colored cables are extensions from phanteks. I originally had them for the GPU as well, but removed it during troubleshooting. So I don't believe that the problem lies in those. Or could the extensions to the 24-pin/8-pin be causing this?
 
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Not sure if the extensions are causing this since the debug led points at the gpu but for trouble shooting might it be good to stick to original.

Good that the pcie cable is seated well, you stil use only one cable = two connectors, would like you to test with two pcie cables coming from the psu each using only the first connector.
 
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Vic 40 said:
Not sure if the extensions are causing this since the debug led points at the gpu but for trouble shooting might it be good to stick to original.

Good that the pcie cable is seated well, you stil use only one cable = two connectors, would like you to test with two pcie cables coming from the psu each using only the first connector.
Click to expand...

I'll remove the extensions and have a go.

I don't have a spare pie cable, but since I've tried the system with another GPU which only used a 6-pin. I wouldn't think that the issue lie there.
 
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Also I've pretty much ruled out that the 3070 is at fault, since I've tested with another GPU and the 3070 works in another system. That's where I'm so confused why the white LED is on. It's like the motherboard doesn't recognize the GPU or something.
 
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Vic 40 said:
The RMx 650watt comes with two pcie cables each holding two connectors for a total of four connectors so you should have two cables.

Still having troubles with the other gpu?
Click to expand...

Unfortunately the box with cables are not with me, so I can't get a hold of them. And yes, still the same issues with another gpu.

I'm thinking of just ordering a new PSU and pray that it works.
 
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Try the other PCIE socket on the power supply with the 1060.
You may have overloaded the output for the first socket.

Or remove PCIE cable from GPU and start the computer .
Test voltages on the PCIE cable with a multi-meter.
If you have proper voltage on the PCIE cable then the PCIE slot may be bad.
Process of elimination .
 
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Unolocogringo said:
Try the other PCIE socket on the power supply with the 1060.
You may have overloaded the output for the first socket.

Or remove PCIE cable from GPU and start the computer .
Test voltages on the PCIE cable with a multi-meter.
If you have proper voltage on the PCIE cable then the PCIE slot may be bad.
Process of elimination .
Click to expand...

Good idea with the multi-meter, I'll try it when I get access to tools on Monday. Since I speculate that it's either the PSU or motherboard that will give me an answer.
 
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Vic 40 said:
Tried the second pcie x16 slot as well? Maybe even look at how pcie 3.0/2.0 is set in the bios, maybe need to really set it to 3.0 for the first/top slot or maybe even test the first/top slot truly set to 2.0.
Click to expand...

Okay so a little update from last time. I ordered an old Ryzen 3000G, and everything worked perfectly. So I RMA´d the CPU and got a new one.. SAME ISSUE. White light at boot. I´m truly lost over here.
 
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Unolocogringo said:
It is starting to sound like the monitor cable is attached to the motherboard instead of the video card from your last post.
When using a video card you must attach the monitor cable to the video card. Not the motherboard headers.
Click to expand...

Would have the same guess if it was me, but the issue lied in the pcie lane itself. Thanks for your response though!
 
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