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Thread: Here's an odd one...
27-06-2012, 08:40 PM #1
Here's an odd one...
When an HDMI cable is connected to my video card (an HD6850) the LEDs on my case's fans light up... Regardless of whether the power is on. Even when the PSU is off or completely unplugged, the lights still glow. What the hell is causing this? The HDMI cable is attached to a switch, which is then attached to my monitor via an HDMI>DVI cable.
27-06-2012, 09:21 PM #2
- Join Date
- Jun 2011
That's actually rather worrying. I'm guessing it's a powered switch box you're using? Sounds like it's feeding-back current through your motherboard, which would be rather a problem. Can you try without the switch box connected?
27-06-2012, 10:50 PM #3
HDMI is leaking energy from your monitor to your pc, the fan is feeding off energy going the wrong way back down your power cables.
Its funny when you think about it. I bet you are powering your fan with an adapter on the power supply main feed rather than via the motherboard, its a shame it isn't spinning your fan. A fan spinning after shutdown for a minute can really improve the lifespan of your pc.^_^
27-06-2012, 11:13 PM #4
The switch isn't powered, and the lights obviously don't turn on when the other end of the HDMI isn't connected to it... The fans in question aren't connected to the motherboard at all, like Helio speculated they're connected to molex adapters. It seems really odd to me that the power is being routed through my video card back to my PSU, though... Yet another reason I regret AMD. I'll have to give it a shot connecting the video card straight to the monitor; it's a little hard to access with my setup.
If they were only staying on for a minute, it wouldn't be a problem because I could easily just forget about it. I don't power my computer down all too often, but when I do I want it to stay down.
28-06-2012, 12:24 AM #5
I have one, I have a USB powered speaker with an LED which remain lit up unless I unplug my printer!(also usb)
Last edited by Heliocentric; 28-06-2012 at 12:27 AM.
28-06-2012, 06:17 PM #6
28-06-2012, 07:17 PM #7
- Join Date
- Jan 2012