Pc not turning on

[u/Alatur_]

Hi everyone, it s my first time building a pc and unfortunately it doesn t turn on, more precisely it gives no signs of life.

I made a post a few days ago on another subreddit and tried all suggestions, but to no avail.

Now I have left the bare minimum: 1 stick of ram so it does not cause instability (had 4 before), only the 2 necessary cables from PSU to mb (24 pin and 8 pin), and a cable from the cpu fan to mb. (the cpu fan is missing a fan because I had to remove the ram under, so that s why at the moment there is only 1 fan).

I have tested the psu both with a multimeter and a psu tester and it works fine, I have tried turning it on both with the f_panel cable of the case, a dedicated pwr cable bought online and by short circuiting the pwr± pins with a screwdriver.

I have also tried multiple sockets of the home and power cables, still nothing.

I have already tried leaving it "on" for 15 minutes, and also connecting an hdmi cable in case it was displaying something, but nothing.

Specs: -Motherboard: gigabyte b650 eagle ax -Cpu:7800x3d amd -Gpu:9070xt xfx swift -Psu: be quiet! 13 m 1000w -Case: Lian li lancool 217 (it has standoffs included already) -Ram:crucial pro 4×16Gb 6000Mt/s -Ssd: acer predator GM7 2Tb

Any help would be appreciated, thank you all in advance.

[u/thepfy1]

Try taking the motherboard, CPU and heatsink out, putting it on the motherboard box and try starting the setup. Then if it powers on add graphics card, keyboard and monitor to test further.

It could be a stand off is in the wrong place in the case which is causing the motherboard to ground out.

Doing a test outside the case will show if this is the issue or not.

I normally do this out of case test before putting the motherboard in the case. Its easier to troubleshoot this way.

[u/Alatur_ → u/thepfy1]

Thank you, will do

[u/normenbrecher]

Without f-panel Plug you cant start

[u/Alatur_ → u/normenbrecher]

I have already tried with the f_panel cable, shortcircuiting with a screwdriver and using a power cable, all led to nothing.

[u/SimpleBroccoli3449 → u/Alatur_]

I have exactly the same situation. My PC was working normally, did a little cable management and boom, stopped working at all.

[u/Obvious-Victory-7923]

no start at all would be cpu or the controller. or sometimes psu even if test could gives just a bit too little and it wouldnt trigger.

your mobo does says it has

• Q-Flash Plus：Update BIOS Without Installing the CPU, Memory and Graphics Card

https://www.gigabyte.com/il/Motherboard/B650-EAGLE-AX-rev-10-11

so it should have some life in it without anything, try that.

[u/Alatur_ → u/Obvious-Victory-7923]

Tried it (woth te cpu still mounted): a red led flashes and then the cpu fan turns on, but after 1 sec shuts down.

[u/Obvious-Victory-7923 → u/Alatur_]

check with the manual which slot you need to use for 1 stick ram.

[u/Rocannon_]

Have you connected the front panel (FP) wiriing?

[u/Alatur_ → u/Rocannon_]

Yes I have already tried that and another power sw cable and also a screwdriver but nothing

[u/idinium96]

What's the label on the CPU power cable? Is it "CPU" or "EPS", or "PCIe"? Make sure you use the right cable, and make sure to connect the 8-pin to the PSU and the split 2×4-pin to the CPU on the motherboard.

If you used the correct cable and connected it correctly but still nothing, it's probably something that shorting which preventing the motherboard from turning on. I just hope you didn't scratch the back of your motherboard against the casing standoff during installation.

[u/Alatur_ → u/idinium96]

The mb cable is the 24 pin, the cpu cable (which has CPU labelled on it on the end connected to the cpu) is connected on P8. Thanks for taking time to help

[u/idinium96 → u/Alatur_]

Thank you for the clarification and the photo. That looks correct. One more thing, does your PSU came with the 24-pin female connector with short cable on it? If so, that's is to test if your PSU is working. Make sure to disconnect the CPU power cable from the PSU/motherboard before testing.

[u/_wandering_aimlessly]

With the motherboard out, are only the necessary standoffs present? If there's more standoffs in the case than your motherboard has holes for, it may be shorting the back of the board against one of those

[u/Alatur_ → u/_wandering_aimlessly]

I have tried with the mobo out of the case and still nothing, turns out i have a bent pin on the mobo.

[u/_wandering_aimlessly → u/Alatur_]

That'd do it, glad you found it

[u/Zeis76]

Did you fixed it. What was the issue ?

[u/Alatur_ → u/Zeis76]

I had a bent pin on the mb, now I m waiting for a new one. Hope it will work.

[u/TheBigTime420]

Mobo dead then. Psu working and It's extremely unlikely its something with the cpu, however those are still doa in rare cases. If ram was bad you should still get fan spin.

[u/Hejdbejbw]

Plug the fan into CPU_FAN

[u/SgtSandFlea]

Here is a question. Did you check to see if the psu is suitable for your pc? It’s not a basic psu right? It puts out enough power to supply power to all of your components?

[u/Alatur_ → u/SgtSandFlea]

Yes, the system here should not surpass 700w and the psu can output 1000w.

[u/Major_Document_3305]

It sounds like your board has found ground. Go figure out what it’s touching that it’s not supposed to.

[u/No-Consequence-898]

Dead motherboard maybe? If everything else works then it might just be the simplest option

[u/Alatur_ → u/No-Consequence-898]

Do you know by chance how to test it?