USB connector keeps fans on while power off

grantmaster

Honorable
Jul 4, 2013
7
0
10,510
This is bugging me. I have a internal powered USB hub that connects to the USB connectors on the motherboard and is powered by a 4-pin molex (so it powers external hard drives as well).

The thing is, while everything is off (except the PSU, of course), connecting the 9 pin USB connector on the motherboard somehow triggers my motherboard and the fans start turning at a low speed. CPU, case, and even the GPU fan!

This is no sleep issue or windows issue. I searched the forum and tried the [unplug PSU - take out CMOS battery - hold power button for 15 seconds trick]. Didn't work. This seems to be a low-level, hardware level MOBO system issue. PSU on, USB hub connected, boom. Fans turn. My case USB connectors don't cause the same problem.


Motherboard: Gigabyte 965p-ds3.

What the USB device looks like:

http://www.ebay.com/itm/3-5-INTERNAL-CARD-READER-USB-2-0-SD-SDHC-MMS-XD-M2-CF-W-POWER-4-PORT-HUB-/220866464638?pt=US_Memory_Card_Readers_Adapters&hash=item336caacb7e

Does anyone have any idea? Thanks.
 

grantmaster

Honorable
Jul 4, 2013
7
0
10,510
I haven't tried it, although I did wonder the same. But disconnecting the power defeats the purpose of me having the unit in the first place. I can try it just to see, but that won't be a good solution for me.