Question PC Refuses to Boot, CPU light On, (Temporary Fix found)

[PaPies]

The PC refuses to boot after a shutdown, as in like it will start, the fans would be at 100% Speed for some reason and it will give me the CPU light.

The PC refuses to go past bios and eventually operating system.

The only solution that I've found to fix this is, after I turn off the computer, the CPU light turns on, and to turn it off, all I do is remove the display port from the GPU, that way the light turns off, and then I plug in the display port and only then turn it on and it will work, I can also know it will work as fans won't spin at 100% speed.

Only after finding this "temporary" fix I thought it's the GPU, so then I tried 3 more GPU's, same problem.

CPU Runs fine, did a 12 hour stress test.

I have no idea as to why it turns on and if there is a pattern that can be fixed.

z490 gaming x, latest bios.
10700K
RTX 2070
750W Gold
Win10

 

[Darkbreeze]

Definitely sounds like a motherboard issue to me, but I might suggest that you try completely removing the graphics card and try using the HDMI output from the motherboard to see if you still have issues. There might be an issue with the PCIe circuit on your board. Since three different graphics cards all do the same thing, it almost has to be the board but might still be something weird.

Trying it without any graphics card installed using the HDMI output on your board should at least tell us a couple of things we don't currently know. The fact that you get a CPU light and not a GPU light somewhat suggests that maybe something like a motherboard pin that was barely bent during installation might have, over time, become worse, and developed into a problem. It might not be the worst idea to pull the CPU cooler and CPU and check the board very closely with a magnifying glass to verify that there are not any bent pins at all. You'll need to replace the thermal paste after doing so, which means also cleaning off the old paste from both the CPU heatspreader and bottom of the CPU cooler.

I'd also try disconnecting ALL other hardware including drives, third party fan or RGB controllers, all but one stick of memory, etc., to see if you still have the same problem with only absolute minimal hardware attached.

How To - Motherboard bench testing

Finding the problem through bench testing If you are here then it’s likely you have encountered a serious hardware issue and have been unable to resolve it using the standard no-POST troubleshooting procedures. If you have not yet attempted to resolve your issues using the no-POST...

forums.tomshardware.com

 

[PaPies]

Definitely sounds like a motherboard issue to me, but I might suggest that you try completely removing the graphics card and try using the HDMI output from the motherboard to see if you still have issues. There might be an issue with the PCIe circuit on your board. Since three different graphics cards all do the same thing, it almost has to be the board but might still be something weird.

Trying it without any graphics card installed using the HDMI output on your board should at least tell us a couple of things we don't currently know. The fact that you get a CPU light and not a GPU light somewhat suggests that maybe something like a motherboard pin that was barely bent during installation might have, over time, become worse, and developed into a problem. It might not be the worst idea to pull the CPU cooler and CPU and check the board very closely with a magnifying glass to verify that there are not any bent pins at all. You'll need to replace the thermal paste after doing so, which means also cleaning off the old paste from both the CPU heatspreader and bottom of the CPU cooler.

I'd also try disconnecting ALL other hardware including drives, third party fan or RGB controllers, all but one stick of memory, etc., to see if you still have the same problem with only absolute minimal hardware attached.

How To - Motherboard bench testing

Finding the problem through bench testing If you are here then it’s likely you have encountered a serious hardware issue and have been unable to resolve it using the standard no-POST troubleshooting procedures. If you have not yet attempted to resolve your issues using the no-POST...

forums.tomshardware.com

I will try that, but I do not have an HDMI cable at hand and have to order one tomorrow morning. What if I try the GPU on the second slot instead?

 

[Darkbreeze]

Trying it on the second slot is definitely an option, and that too will tell us a few things.

It CAN tell us whether there is a problem with ONLY that specific slot if it works fine in one of the secondary slots BUT keep in mind that for MOST boards, the secondary or tertiary PCIe slots usually won't run at the full x16 speed that the primary slot runs at. Some will, but most of them usually won't. Usually the secondary slots will only run at x8 speeds even if there is not already a card installed in the primary x16 slot. But for the purposes of troubleshooting, it's fine as a tool.

It might also tell something if neither slot wants to work properly, but then again, it might not tell us anything other than the problem still exists rather than it's specifically a problem with the PCIe bus somewhere.

Always good to have an HDMI cable on hand, and to be honest if you have a repair shop anywhere near you and if they are anything like I am with my services, they might be willing to just let you borrow one as they likely have dozens of them, because it's good customer service that might bring in a new customer if the cable doesn't help to identify the problem. Of course, you can just take it back to them and not take them your business if you choose to or if you find the problem on your own. Personally I think it's just better to have one on hand because sometimes problems simply develop with a specific port on a graphics card while using a different port or different type of port works fine. And for other things like connecting additional monitors to your system or a laptop or whatever. I too have dozens of them but then again I work on systems as a semi-profession anyhow.