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Sparks from MB on startup!

Abnormalia
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I got this build more than 1.5 year and its working mostly stable except few bad BIOS versions. X3900 + Asus Hero VIII + 64 GB memory + 1080 Ti.

So I went out of city for weekend and when returned and tried to turn PC, nothing no reaction, only memory LEDs were turned on, not a single Fan or other reaction.

Tried to turn off/on PSU, nothing.  Opened side panel, turned off PSU, waited 5 sec and pushed start button on MB, same only memory leds turned on.

Repeated and this time, sparks somewhere near memory slots and computer turned on. It booted and seems ok.

Inspected MB no burned marks, what may cause this ? What should I check or test? Is MB dying ?

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What PSU?

CPU: AMD Ryzen 9 5900X · Cooler: Artic Liquid Freezer II 280 · Motherboard: MSI MEG X570 Unify · RAM: G.skill Ripjaws V 2x16GB 3600MHz CL16 (2Rx8) · Graphics Card: ASUS GeForce RTX 3060 Ti TUF Gaming · Boot Drive: 500GB WD Black SN750 M.2 NVMe SSD · Game Drive: 2TB Crucial MX500 SATA SSD · PSU: Corsair White RM850x 850W 80+ Gold · Case: Corsair 4000D Airflow · Monitor: MSI Optix MAG342CQR 34” UWQHD 3440x1440 144Hz · Keyboard: Corsair K100 RGB Optical-Mechanical Gaming Keyboard (OPX Switch) · Mouse: Corsair Ironclaw RGB Wireless Gaming Mouse

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That's definitely not good. A lot of things could have caused that: improperly seated memory modules causing a short, PSU issue, or motherboard issue to name the most likely. You said the mem LEDs were turned on? It could be faulty ram sticks or not properly seated, take them out, blow them off with a can of compressed air, stick em back in and see if the sparks happen again. If no sparks, fixed. If sparks, motherboard issue.

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Sparks could mean something isn't connected/seated correctly and the electricity has to bridge a very small gap. Or a small amount of dust got into a connector and is blocking the current or shorting pins (dust usually isn't conductive, but maybe something conductive got into a slot).

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7 minutes ago, Chris Pratt said:

What PSU?

Corsair AX 850

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10 minutes ago, Mel0nMan said:

That's definitely not good. A lot of things could have caused that: improperly seated memory modules causing a short, PSU issue, or motherboard issue to name the most likely. You said the mem LEDs were turned on? It could be faulty ram sticks or not properly seated, take them out, blow them off with a can of compressed air, stick em back in and see if the sparks happen again. If no sparks, fixed. If sparks, motherboard issue.

Will try that soon, thanks !

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Update 1 week later : tested every possible way, work as usual not an single accident on idle and on high loads

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