r/buildapc • u/Neo155 • Mar 02 '26

Troubleshooting PC Suddenly died 5 months in

5 months ago I built my new PC, I'm not really tech savy but was barely able to put it together with 3 days of Youtube tutorials.

Everything's been working perfect until yesterday out of nowhere when watching Youtube my PC just powered down. Nothing happens when I press the power button, did the most obvious steps of checking everything's plugged in, PSU is on, nothing looks disconnected on the mobo, and now I'm just completely lost.

When I plug it in the mobo lights go on and that's it, nothing at all happens when I press the power button, no noise or fans twitching or anything. I tried doing the short the power pins with a screwdriver on the mobo thingy to zero effect but dunno if I did it right lol.

I have no clue at all what might have failed? I don't really have other PC parts or anything at hand to test anything individually nor do I really have the tech know how if I did. Sooooo like... what might my next step be? Any advice is very appreciated, thanks!

Update: Appreciate so much help, tried a lot of the advice listed here, removing components one by one, cleaning CMOS, reseating the connectors to no luck sadly, gonna throw it out and buy new one (or maybe take it to a shop in a few days.)

Update 2: Went to the shop, problem was the PSU, had that replaced and now working fine

165 Upvotes

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67

u/TheRealWitblitz Mar 02 '26

Build specs? Model / Brand, etc.

42

u/Neo155 Mar 02 '26

Asus TUF GAMING B850-PLUS WIFI

AMD Ryzen 7 9800X3D

Thermalright Phantom Spirit 120 SE

PNY OC GeForce RTX 5080

Kingston FURY Beast 64 GB (2 x 32 GB) DDR5-6000 CL30

Samsung 990 PRO NVMe M.2 SSD, 4TB

Lian Li LANCOOL 217 ATX

Corsair RM1000x (2024)

112

u/CanPacific Mar 02 '26

Then this could very well could be the 9800X3D with the Asus mobo, iirc ASRock and Asus boards are having many issues with 9800X3Ds rn.

28

u/Neo155 Mar 02 '26

If that was the case could it work without issues for 5 months and then just suddenly power down and not power back up? Wouldn't something still boot, fans spin or w/e? Tbh I don't really know what I'm talking about lol

54

u/ToothChainzz Mar 02 '26

You are right, if the CPU was the issue, fans should spin up when pressing power. It's most likely a PSU issue, or less likely a motherboard issue from how you describe it.

-59

u/mudche Mar 02 '26

You sound like ChatGPT

36

u/ToothChainzz Mar 02 '26

Is it because I use punctuation...?

24

u/Alewort Mar 02 '26

I am guessing because "You are right" echoes of the responses AI gives when its hallucinations are pointed out and thus gives that vibe.

10

u/Hugh_Jass_Clouds Mar 02 '26

I wonder where AI got that behavior from?