CPU led on motherboard is on | Linus Tech Tips | Page 1

junior path Dec 26, 2022, 1:11 AM

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it's a new system: 13600k + b660m + 6650xt+750w psu. I got a 12100f to troubleshoot but system still couldn't boot

harsh thorn Dec 26, 2022, 1:18 AM

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The B660M does not ship with a BIOS compatible with the 13600K. You will need to flash it before you can proceed.

junior path Dec 26, 2022, 2:14 AM

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yeah I thought that might be the case, and I got a 12100f. when I put that in, nothing changes

harsh thorn Dec 26, 2022, 3:18 AM

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Okay. How does your CPU socket look?

junior path Dec 26, 2022, 4:32 AM

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I don't see any bent pins.. I'll send a pic soon

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rn_image_picker_lib_temp_b768b68d-5f09-43ac-828d-174ddbd9d9de.jpg

harsh thorn Dec 26, 2022, 4:45 AM

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Looks good.

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Okay. What surface are you currently working on?

junior path Dec 26, 2022, 4:47 AM

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you mean where the mobo is? it's currently in the case

harsh thorn Dec 26, 2022, 4:50 AM

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Okay. And you have ensured that only the correct standoffs are installed?

junior path Dec 26, 2022, 4:51 AM

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I didn't install any standoffs, could that be the problem?

harsh thorn Dec 26, 2022, 4:51 AM

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Motherboard standoffs?

junior path Dec 26, 2022, 4:51 AM

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yeah no mobo standoffs

harsh thorn Dec 26, 2022, 4:53 AM

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Remove the motherboard and show me.

junior path Dec 26, 2022, 4:58 AM

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harsh thorn Dec 26, 2022, 4:59 AM

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Yeah you see those black nubs? Those are standoffs.

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And this looks like the Corsair 4000D

junior path Dec 26, 2022, 4:59 AM

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ah ok.. those came with the case, I didn't add any

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yes it's 4000d

harsh thorn Dec 26, 2022, 5:00 AM

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Okay some boards require that you remove some standoffs. See that you have no more standoffs than mounting holes on your board.

junior path Dec 26, 2022, 5:00 AM

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ok gimme a sec

harsh thorn Dec 26, 2022, 5:00 AM

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If there are standoffs that go beyond your board coverage, you don't need to remove them.

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I assume this is a mATX board?

junior path Dec 26, 2022, 5:01 AM

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my mobo is msi b660m-a d4

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yes

harsh thorn Dec 26, 2022, 5:02 AM

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Okay it looks like you have the correct standoffs installed.

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Do you have another 4-pin CPU power cable? This could also be a 8-pin block made up of two 4-pin blocks

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I wonder if your Motherboard is refusing to start up because you do not have all the CPU power inputs occupied?

junior path Dec 26, 2022, 5:08 AM

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I don't have extra CPU power cables

harsh thorn Dec 26, 2022, 5:09 AM

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What PSU do you have?

junior path Dec 26, 2022, 5:09 AM

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superflower 80+gold

harsh thorn Dec 26, 2022, 5:09 AM

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The exact model number please.

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Do you have your purchase order available?

junior path Dec 26, 2022, 5:11 AM

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SF-850F14HG, it's 850w not 750w

harsh thorn Dec 26, 2022, 5:12 AM

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Okay then yes you do have another CPU cable in there somewhere. check your box

junior path Dec 26, 2022, 5:14 AM

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what I have in the box are 2 GPU cables, 1 peripheral and 3SATA cables

harsh thorn Dec 26, 2022, 5:15 AM

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That does not make sense. Did you buy this new?

junior path Dec 26, 2022, 5:15 AM

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was I supposed to get a different set of cables?

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yes it's new

harsh thorn Dec 26, 2022, 5:15 AM

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Send a picture of the connector side of the power supply

junior path Dec 26, 2022, 5:19 AM

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harsh thorn Dec 26, 2022, 5:19 AM

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Yes you should have another CPU power cable. That PSU ships with two EPS 8-pin cables.

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See if you accidentally used one as a VGA cable

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Should not be possible, but check

harsh thorn Dec 26, 2022, 5:24 AM

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junior path

Oh, no it is possible for a EPS cable to slot into a VGA block on this supply. Check that you didn't accidentally use one of the CPU cables on the graphics card.

junior path Dec 26, 2022, 5:27 AM

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oh sorry for the confusion, I have 2 CPU cables already plugged into the PSU along with the mobo and GPU cables

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thought you wanted to see the PSU sockets w/o the cables so I took them off

harsh thorn Dec 26, 2022, 5:28 AM

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No. LOL.

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You had both of those plugged in to the board?

junior path Dec 26, 2022, 5:28 AM

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yes

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is there a way to check if one of them is faulty? I have another system but with different PSU and mobo

harsh thorn Dec 26, 2022, 5:30 AM

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You can try swapping the power supplies and see if it comes up

junior path Dec 26, 2022, 5:31 AM

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ok I'll do that in a bit, will reply here when I have tried that

#CPU led on motherboard is on