PC front panel LED light always on

October 27, 2008 at 06:13:31
Specs: Win XP Home, 2.75 Ghz/2GB
Hi, I recently replaced the older motherboard on my PC with a new one. I noticed now that on the PC front panel, which has 2 lights, one red for HD and on green for reset (I think), when the PC is shut down the green LED light stays on permanently. Only when the powerstrip is turned off will the light also turn off. Does anyone know why? Is this a problem? How can this be fixed? I am pretty sure I wired the front panel connectors correctly, but ...? Thanks!

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October 27, 2008 at 10:37:56
I would say that you didn't connect it up properly.

"If my answers frighten you then you should cease asking scary questions" - Jules Winnfield (Samuel L. Jackson) in Pulp Fiction

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October 27, 2008 at 11:52:23
Yeah, check the motherboard manual for pin placement for 'power LED'.

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October 27, 2008 at 12:10:05
double check power and ground wires, and make sure that not only have you connected the front panel wires to the correct mobo pins, but that they are oriented the correct way. For example, you may have identified the correct 2 motherboard pins for your front green LED. But if you have Pin A connected to Wire B and Pin B connected to Wire A, you may not see the right LED behavior. Like light when it should be dark, or darkness when it should be lit.

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October 28, 2008 at 12:43:17
Thnks for all your answers, I will double check.

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November 2, 2008 at 19:51:24
UPDATE: OK, double checked the computer, here my findings:

1. The front panel connectors on the ECS A780GM-A motherboard are are ALL correctly connected.

2. The power LED light is dimly lit when the computer is turned off, turns to fully light when the power switch is turned on.

3. The PC is connected to an HP Laserjet 1100. Since the motherboard does not have an on-board parallel port and the printer has a very special cable I purchased a parallel port PCI card, which is in one of the PCI slots. BTW - This type of HP printer does NOT have a power switch, it goes into some form of hibernation when not used. Plus the connector end of the cable that plugs into the printer seems to be a one of a kind.

4. The Power LED light turns off completely when the printer is unplugged from the PC, the light is dimly lit again when the cord is reconnected.

I have done some research on this subject, answers ranged from defective motherboard to normal motherboard/PC behavior. Questions: Could there be something wrong with the PCI card, e.g. defective or not pushed into the slot completely (BTW - the printer works fine)? Could it be the drivers? Does the printer type have anything to do with it? Will the light being on dimly damage the motherboard or the lights/switches? This problem did not exist with the old motherboard, ECS K7S5A. A very tricky one for me, maybe one of you will have an explanation/answer - THANKS!

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November 2, 2008 at 21:19:24
Obviously, power from the printer is finding a path through the card to the motherboard. That could be just the way it is, a design flaw with the card or a grounding problem. Not likely to be a motherboard problem unless it has the bad ground.

Are all the power cords the 3-conductor type and plugged into a power strip or wall socket that is grounded? If your equipment is connected through a UPS or power strip, temporarily connect them directly to the wall socket and see if that makes a difference.

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