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Smoking PC (not anymore)

DatSniper
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Attention readers: This has not been a problem after the incident, I just wish to find out what happened.

A long while back, like 6 months ago, i heard a zap from my PC and almost immediately smoke started coming out of the front panel. I quickly unplugged my PC from the wall and disassembled it. Nothing was wrong with it, no visual problems and nothing was hotter than usual. I took the 24 pin mobo power connector off and tested any problems with the PSU with a paper clip. (one of those PSU tests you find online) There was nothing wrong with that either. I decided to put the PC back together and try to boot it, and it worked flawlessly. Nothing had gone missing nor i was having any performance issues. As I said nothing like this hasn't happened ever after that one case, and I still haven't figured out what it was.

From general interest on what happened, now I'm asking your help on this.

Specs:


Mobo: Acer Aspire XC-705 prebuilt mobo
CPU: Intel i5-4460

Graphics card: Gigabyte GeForce GTX 1050 Ti D5 4GB

Memory: Kingston HyperX Fury black 16GB (2x 8GB) DDR3-1600MHz
PSU: FSP Group FSP750-50ERN 750W 80+ Silver
Storage: WD Blue 1TB 7200RPM
 

Cooling:

 

Intel stock CPU cooler

NZXT FZ-200 200mm fan slapped on the side panel

Small 40mm fan on the front panel

NZXT GRID Fan controller

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smoke? resistor maybe, or a short that's melting plastic

CPU: i7-2600K 4751MHz 1.44V (software) --> 1.47V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 103.3MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 2133MHz 10-11-11-30 CR2, custom: 2203MHz 10-11-10-26 CR1 tRFC:230 tREFI:14000) GPU: Asus GTX 1070 Dual (Super Jetstream vbios, +70(2025-2088MHz)/+400(8.8Gbps)) SSD: Samsung 840 Pro 256GB (main boot drive), Transcend SSD370 128GB PSU: Seasonic X-660 80+ Gold Case: Antec P110 Silent, 5 intakes 1 exhaust Monitor: AOC G2460PF 1080p 144Hz (150Hz max w/ DP, 121Hz max w/ HDMI) TN panel Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1

 

Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV SA undervolt) GPU: GTX 1060 6GB Mobile (+80/+450, 1650MHz~1750MHz 0.78V~0.85V) RAM: 8+8GB DDR4-2400 18-17-17-39 2T Storage: 1TB HP EX920 PCIe x4 M.2 SSD + 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172), 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally Monitor: 1080p 126Hz IPS G-sync

 

Desktop benching:

Cinebench R15 Single thread:168 Multi-thread: 833 

SuperPi (v1.5 from Techpowerup, PI value output) 16K: 0.100s 1M: 8.255s 32M: 7m 45.93s

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2 minutes ago, RollinLower said:

do all connectors on your front panel still work?

all but the audio, the connector was too short when I upgraded my PC

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I'd RMA the PSU. What PSU is it? Look on your motherboard, check to see if there is anything missing or scorch marks.

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42 minutes ago, Firewrath9 said:

I'd RMA the PSU. What PSU is it? Look on your motherboard, check to see if there is anything missing or scorch marks.

PSU: FSP Group FSP750-50ERN 750W 80+ Silver
It's already over a year old, and i don't even know if it has warranty left, also i don't remember where i even bought it

I haven't seen any markings on the mobo

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