F5F Stay Refreshed Hardware Desktop These PC case fans keep spinning even when the computer isn't running, especially when the power button is pressed.

These PC case fans keep spinning even when the computer isn't running, especially when the power button is pressed.

These PC case fans keep spinning even when the computer isn't running, especially when the power button is pressed.

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Ivanrex
Junior Member
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25
01-23-2026, 01:03 AM
#1
I added the new DIYrgb Q3 case, the fake lian li case, and whenever I connect the 3-pin RGB cable for my 3 case fans, they continue running even when the PC is off. All these fans use Molex connectors and function properly without the 3-pin plug. Motherboard: Gigabyte B450M DS3H WiFi Case: https://www.newegg.com/p/N82E16811353225 Power Supply: Apevia ATX-PR600W Prestige 600W
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Ivanrex
01-23-2026, 01:03 AM #1

I added the new DIYrgb Q3 case, the fake lian li case, and whenever I connect the 3-pin RGB cable for my 3 case fans, they continue running even when the PC is off. All these fans use Molex connectors and function properly without the 3-pin plug. Motherboard: Gigabyte B450M DS3H WiFi Case: https://www.newegg.com/p/N82E16811353225 Power Supply: Apevia ATX-PR600W Prestige 600W

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NoahWraith
Member
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199
01-26-2026, 03:20 AM
#2
Your fans keep running when the PSU is turned off, which isn't ideal. Check if removing the 24 PIN still causes this issue. Did you use unapproved Apevia cables for any connections? Or are pins touching the mobo's power rail for switching? That could damage something. If you remove both the 24 pin and the On/Off jumper, nothing should be active. If it stays on, the PSU might be faulty—can you get warranty help?
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NoahWraith
01-26-2026, 03:20 AM #2

Your fans keep running when the PSU is turned off, which isn't ideal. Check if removing the 24 PIN still causes this issue. Did you use unapproved Apevia cables for any connections? Or are pins touching the mobo's power rail for switching? That could damage something. If you remove both the 24 pin and the On/Off jumper, nothing should be active. If it stays on, the PSU might be faulty—can you get warranty help?

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LMJ_Roy
Junior Member
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9
01-26-2026, 02:01 PM
#3
It occurs only when I connect the 3-pin connector to the motherboard. PSU extensions didn't cause it either, and the issue persists even without them. The power supply unit is fixed and not modular.
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LMJ_Roy
01-26-2026, 02:01 PM #3

It occurs only when I connect the 3-pin connector to the motherboard. PSU extensions didn't cause it either, and the issue persists even without them. The power supply unit is fixed and not modular.

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Komodo88
Senior Member
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749
01-27-2026, 09:01 AM
#4
The label you're connecting isn't getting power from elsewhere and sending it back to the board. It seems like a power supply issue might be the problem, though it's confusing!
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Komodo88
01-27-2026, 09:01 AM #4

The label you're connecting isn't getting power from elsewhere and sending it back to the board. It seems like a power supply issue might be the problem, though it's confusing!

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ThaTylor
Member
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51
01-27-2026, 09:35 PM
#5
It doesn't seem to be the power supply issue since it functioned properly on another system.
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ThaTylor
01-27-2026, 09:35 PM #5

It doesn't seem to be the power supply issue since it functioned properly on another system.

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iiSweeTzz
Posting Freak
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862
02-02-2026, 01:13 AM
#6
It just doesn't make sense, the RGB connector runs off 5v, the fans should run off 12v. The 12v line is off when the PC is off, the 5V may still be on however though I wouldn't expect the RGB to be connected to 5VSB, but they might. Buthow are the fans getting 5v if they are correctly connected to 12v? They are completely different rails on the PSU.
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iiSweeTzz
02-02-2026, 01:13 AM #6

It just doesn't make sense, the RGB connector runs off 5v, the fans should run off 12v. The 12v line is off when the PC is off, the 5V may still be on however though I wouldn't expect the RGB to be connected to 5VSB, but they might. Buthow are the fans getting 5v if they are correctly connected to 12v? They are completely different rails on the PSU.

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