Funny sound from mobo

Hi. Ive an Asus A7V 266 motherboard approx 2 years old. Recently Ive
been running it with case open and noticed that whenever the power is
turned off , the green LED on the board goes off just a few seconds
later (stays on a few seconds, without power from mains/UPS). Also
there is a sound, a very very low sound like a ... well ... whistle
which slowly dies out (its tough to put in words, hope you're getting
the idea).
Thought it might be related to some capacitor charges etc. so I left
the power on (system off) overnight but it did not help. Is the board
dying ????

"Atul" wrote in message
om...
Hi. Ive an Asus A7V 266 motherboard approx 2 years old. Recently Ive
been running it with case open and noticed that whenever the power is
turned off , the green LED on the board goes off just a few seconds
later (stays on a few seconds, without power from mains/UPS). Also
there is a sound, a very very low sound like a ... well ... whistle
which slowly dies out (its tough to put in words, hope you're getting
the idea).
Thought it might be related to some capacitor charges etc. so I left
the power on (system off) overnight but it did not help. Is the board
dying ????

The board is probably just fine...
I'm sure it's just a capacitor discharging.

"Atul" wrote in message
om...
Hi. Ive an Asus A7V 266 motherboard approx 2 years old. Recently Ive
been running it with case open and noticed that whenever the power is
turned off , the green LED on the board goes off just a few seconds
later (stays on a few seconds, without power from mains/UPS). Also
there is a sound, a very very low sound like a ... well ... whistle
which slowly dies out (its tough to put in words, hope you're getting
the idea).
Thought it might be related to some capacitor charges etc. so I left
the power on (system off) overnight but it did not help. Is the board
dying ????

Have you checked the motherboard for blown capacitors ? ( bulging, domed topped or fliud
marks around the bottom seal ) It sounds like it could be gas leaking out of one. It may
be one of the coils on the motherboard whistling as the frequency of the switch driving it
drops at power off or the noise may not be coming from the motherboard, it could be the
PSU or its AXT connector for the motherboard.
Another possibiliy is the system speaker, a fault on the motherboard could cause it to
whine for some obscure reason.
--

Hi. Ive an Asus A7V 266 motherboard approx 2 years old. Recently Ive
been running it with case open and noticed that whenever the power is
turned off , the green LED on the board goes off just a few seconds
later (stays on a few seconds, without power from mains/UPS). Also
there is a sound, a very very low sound like a ... well ... whistle
which slowly dies out (its tough to put in words, hope you're getting
the idea).

I've got an Asus P4G8X that does a similar thing. A few seconds after the
power goes off, it goes "eep".

I don't think it's anything to worry about.

Thanks for the responses. There are no blown capacitors on the board.
Maybe the sound is normal after all since im not the only one hearing
it.