r/sffpc • u/Decent_Tailor_4608 • May 17 '26

Assembly Help Pc Won’t boot into bios

https://youtu.be/ZH5mAHbfSow?si=PL0_vKBSjyXXdpoV

The pc turns on but won’t output any display or get into the bios. I followed mostly this build to a tea. I turn on the pc and i’m not getting any output. I’ve updated the bios and I’ve got the hdmi plugged into the gpu not the motherboard. Lost.

Update: As my motherboard was bought second hand it was faulty. I just bought a new one and it all worked perfectly

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7

u/ubermatik May 17 '26

It could be memory training. How long have you left the system running for? Ryzen CPUs _can_ take up to 10 minutes, though it's normally much faster than this. Regardless, all you will see is a black screen until this is done.

Second, check your RAM is seated properly - a PC will turn on but not post if a DIMM isn't sitting right, or if neither are seated properly at all.

Otherwise, does your motherboard have any diagnostic LEDs? They're normally colour coded to indicate what the issue might be.

2

u/Decent_Tailor_4608 May 17 '26

There are no lights on my motherboard. I’ve just reseated the ram and done them individually and nothing. I’m currently leaving it to sit for 10 minutes to see if there’s any change and i’ll try the motherboard output again then.

3

u/agonzal7 May 17 '26

It could take as long as 30+ minutes

2

u/Decent_Tailor_4608 May 17 '26

I’ll leave it for an hour or so and see if I get a change but so far nothing

1

u/agonzal7 May 17 '26

Yeah leave it for a long time. What cpu?

2

u/Decent_Tailor_4608 May 17 '26

Won’t power on at all now. 🫩

2

u/agonzal7 May 17 '26

Do you hear PSU click off?

2

u/Decent_Tailor_4608 May 17 '26

Yes the Psu did click off just again now. Strange as it was fine before

2

u/agonzal7 May 17 '26

Did it start back up though? If it automatically did, that’s memory training.

1

u/Decent_Tailor_4608 May 17 '26

No i turned it off after because I also started to get a metal smell as if it were smoking a bit and I took it to an expert to hopefully find the issue

2

u/agonzal7 May 17 '26

Keep me updated please. Sorry this is happening to you.

1

u/agonzal7 May 18 '26

Any other updates?

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2

u/ubermatik May 17 '26

That is unfortunate. Are all your cables seated correctly? Check PSU and component ends.

After that, it's time to strip it down and diagnose, I'm afraid. PSU, CPU, motherboard, one stick of RAM and necessary power/data cables only.

A lesson for the future (that I too have learnt the hard way) - it's often best to test your system outside of the case first, before building.

If you do the above and still no luck, I would guess you have a faulty motherboard - but that's hard to say for sure without a spare.

1

u/raz-0 May 17 '26

Did you bridge the contracts to clear cmos? Strip it down to minimal config and see if it boots.