HELP: Unknown power issue (PSU/MOBO)

[Tritanomatic]

Hi all, first time posting here.
Built my PC yesterday, turned it on and it worked fine. Downloaded windows, browsed chrome, played games etc., then turned it off (PSU switch off, 3-pin power plug off).
Today, Opened it up to put in some RGB light strips. Connected correctly (4pin 12v to 12v), checked all connections fine and tight, no cables/random stuff touching MOBO/GPU/etc., then tried turning it on

---

First attempt:
Turned on power plug, nothing (expected). Then turned on PSU switch. heard electrical buzz and saw electricity on MOBO (easy to see since the inside was dark). turned off PSU quickly.

Second attempt:
Opened up PC and checked all connections, then plugged into different 3-pin power extension. Turned on power plug and PSU switch, nothing, then pressed power button on case. PC turned on as expected (case/cpu/gpu fans on, MOBO/GPU/Fan/RGB strips on). Did not plug in a screen so did not see anything.

Third attempt: moved PC back to first attempt spot, plugged 3-pin back to first 3-pin power extension. Turned on power plug and PSU switch, same result as first attempt (MOBO electricity heard/seen).

---

At this point I decided it would be wiser to consult online before trying anything else. Couldn't find a similar situation/solution, so I decided to post it on a forum. If anyone knows anything about this, I would be very appreciative!

Parts list, all new:
(Motherboard) GIGABYTE X570 AORUS ELITE
(PSU) Superflower Leadex III Gold 850W Gold
(CPU) AMD Ryzen 9 3900X
(GPU) GIGABYTE RTX 2080 Super
(Case) Rosewill ThorV2
(RAM) (4 X 8GB) CORSAIR Vengeance LPX

Generic 3pin power extension details (Nothing else was plugged in):
Rate voltage - 250V a.c; 50Hz
Rate current - 13A max
Rate Watts - 3000 watts max
ON/OFF switch - 13A; 3250 watts max

 

[Phen8210]

Easy rma both the PSU and mobo

 

[Hafi]

disconnect RGB lighting strips and plug PSU power directly onto the wall socket instead of extension.

 

[irbadboyz]

Plug out your LED strip, but leave them in their place, turn on. - Document the result

Remove LED strip completely, turn on. -Document the result.

 

[cscs3]

Hi all, first time posting here.
Built my PC yesterday, turned it on and it worked fine. Downloaded windows, browsed chrome, played games etc., then turned it off (PSU switch off, 3-pin power plug off).
Today, Opened it up to put in some RGB light strips. Connected correctly (4pin 12v to 12v), checked all connections fine and tight, no cables/random stuff touching MOBO/GPU/etc., then tried turning it on

---

First attempt:
Turned on power plug, nothing (expected). Then turned on PSU switch. heard electrical buzz and saw electricity on MOBO (easy to see since the inside was dark). turned off PSU quickly.

Second attempt:
Opened up PC and checked all connections, then plugged into different 3-pin power extension. Turned on power plug and PSU switch, nothing, then pressed power button on case. PC turned on as expected (case/cpu/gpu fans on, MOBO/GPU/Fan/RGB strips on). Did not plug in a screen so did not see anything.

Third attempt: moved PC back to first attempt spot, plugged 3-pin back to first 3-pin power extension. Turned on power plug and PSU switch, same result as first attempt (MOBO electricity heard/seen).

---

At this point I decided it would be wiser to consult online before trying anything else. Couldn't find a similar situation/solution, so I decided to post it on a forum. If anyone knows anything about this, I would be very appreciative!

Parts list, all new:
(Motherboard) GIGABYTE X570 AORUS ELITE
(PSU) Superflower Leadex III Gold 850W Gold
(CPU) AMD Ryzen 9 3900X
(GPU) GIGABYTE RTX 2080 Super
(Case) Rosewill ThorV2
(RAM) (4 X 8GB) CORSAIR Vengeance LPX

Generic 3pin power extension details (Nothing else was plugged in):
Rate voltage - 250V a.c; 50Hz
Rate current - 13A max
Rate Watts - 3000 watts max
ON/OFF switch - 13A; 3250 watts max

First thing you should do is to remove the RBG LED light strips.

 

[Koenig168]

...
First attempt:
Turned on power plug, nothing (expected). Then turned on PSU switch. heard electrical buzz and saw electricity on MOBO (easy to see since the inside was dark). turned off PSU quickly.

...

What does "electricity on MOBO" mean? Sparks? Bright electrical discharge (like mini lightning)?

 

[Hafi]

What does "electricity on MOBO" mean? Sparks? Bright electrical discharge (like mini lightning)?

most likely cap@acitor "burst"

 

[grimfan]

Highly likely there was a short (circuit) on the motherboard and something is now burnt/damaged.

Disassemble the motherboard and examine under magnification to check for burnt marks to confirm.

I personally won't feel comfortable using the motherboard again. Risk to other components (if not already) is too great.

 

[Gondon72]

dont self test already. RMA it.

 

[seikokingkong]

After changing CPU fan. Whole system cannot power on. Omg