Weird Power LED Behavior - Tilted Forum Project Discussion Community

Glava · 01-26-2005, 12:06 PM

I recently changed my motherboard to a Biostar M7NCD, and it has been excellent except for one little problem: the power LED on the case sometimes doesn't come on. If I were to shut down my computer, unplug the power cable, and plug it back in, the LED wouldn't turn on when I turned on my computer. However, if I simply shut it down without unplugging the power, and turn it back on, the LED would work properly. The IDE LED, however, always works fine. I definitely hooked it up correctly, and I can't figure out this problem.

Also, sometimes, especially when under load, my computer makes a whistling sound. Any hypotheses as to that annoyance?

Scorpion23 · 01-26-2005, 01:33 PM

I don't know about the LED, but the whistling sound is probably a temp. controlled fan running at full speed.

sashime76 · 01-27-2005, 11:18 AM

Inspect all the motherboard screws that connect the board to the case. Perhaps one (or more) is not installed properly. Check and see if you have proper clearence between the MB and case. There should be standoffs where you screw the MB to the case.

Glava · 02-08-2005, 07:17 AM

I changed the case and power supply (for different reasons) and the power LED problem persists. It must be the motherboard, but I really dont want to RMA it because of this little problem. Any suggestions?

Scorpion23 · 02-08-2005, 10:05 AM

Well............
I'm not sure how much you know about electronics and what you feel comfortable doing. But you could modify a molex connector with a resistor, bringing the voltage down to 3V. Then hook the power LED to it. You could even use a spare USB header, though they're 5V instead of 12V.

Glava · 02-08-2005, 11:13 AM

Quote:

Originally Posted by Scorpion23

Well............
I'm not sure how much you know about electronics and what you feel comfortable doing. But you could modify a molex connector with a resistor, bringing the voltage down to 3V. Then hook the power LED to it. You could even use a spare USB header, though they're 5V instead of 12V.

I solder incredibly sloppily, so that's not an option for me. What I did instead is get two lighted fans for the front. The LED thing still pisses me off, though.

01-26-2005, 12:06 PM	#1 (permalink)
Glava Betitled	Weird Power LED Behavior I recently changed my motherboard to a Biostar M7NCD, and it has been excellent except for one little problem: the power LED on the case sometimes doesn't come on. If I were to shut down my computer, unplug the power cable, and plug it back in, the LED wouldn't turn on when I turned on my computer. However, if I simply shut it down without unplugging the power, and turn it back on, the LED would work properly. The IDE LED, however, always works fine. I definitely hooked it up correctly, and I can't figure out this problem. Also, sometimes, especially when under load, my computer makes a whistling sound. Any hypotheses as to that annoyance?

01-26-2005, 01:33 PM	#2 (permalink)
Scorpion23 Psycho	I don't know about the LED, but the whistling sound is probably a temp. controlled fan running at full speed.

01-27-2005, 11:18 AM	#3 (permalink)
sashime76 Addict Location: Hoosier State	Inspect all the motherboard screws that connect the board to the case. Perhaps one (or more) is not installed properly. Check and see if you have proper clearence between the MB and case. There should be standoffs where you screw the MB to the case.

02-08-2005, 07:17 AM	#4 (permalink)
Glava Betitled	I changed the case and power supply (for different reasons) and the power LED problem persists. It must be the motherboard, but I really dont want to RMA it because of this little problem. Any suggestions?

02-08-2005, 10:05 AM	#5 (permalink)
Scorpion23 Psycho	Well............ I'm not sure how much you know about electronics and what you feel comfortable doing. But you could modify a molex connector with a resistor, bringing the voltage down to 3V. Then hook the power LED to it. You could even use a spare USB header, though they're 5V instead of 12V.