W510 makes a hissing noise

Hi all,
I just bought a refurbished W510 laptop about two weeks ago. I love it, but for one problem. When I turn off the computer or make it go to sleep it will hiss when the lid is closed and the power is connected (in the case or turning it off) or at any time I put it to sleep, power connected or not.
I have updated all the Lenovo suggested updates, which includes a NVIDEA driver. I saw that there was mention of another driver on the NVIDEA site, but I couldn't figure out which one to use.
I have a W510 with 2 gig ram, a quadro FX 880M graphics card, and I'm running Windows 7 32-bit Professional.
I talked with tech support and they said they would send me a new AC adaptor, but that was 2 weeks ago and still nothing (the computer can the next day I ordered it). The power supply is a 135w 20v FRU PIN: 45N0055
Any suggestions?
Thanks!

Mine also makes a hissing noise..I didn't really bother..mine has other major problems..speaker not working, left click under space bar has issues problems..screen open/closing make a cracking noise..

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contacted apple phone support, unfortunately apple care number is not free in australia.
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Hissing noise from the speakers

hi mates,
i hear a hissing sound from the internal speakers whenever the system tries to play sound through the internal speaker, be it a system sound or playing my music, or just by opening a application that may play music, i get this hissing sound before a system sound and this hissing noise continues for some time after the sounds are stopped playing, i get this hissing noise even when i change volume of the speakers. i dont get it through the headphones. the strange thing is i get this hissing noise even if i play a movie when my speakers are muted.
i went through this forum, some members have adviced to reset the pram, smc, reinstall the os, friends i tried all these but still i continue with this problem.
my macbook is brand new and just a week old.
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hi sailor,
contacted apple phone support, unfortunately apple care number is not free in australia.
first time it took 17min and was not able to contact a technician coz credits in my mobile ran out.
second time it took 25min. i explained all the issues
told them i reset the pram, smc and reinstalled the OS and still i hear the hissing noise.
they replied that speakers may make a hissing noise if the macbook is on battery, but the noise should be very low and it should not be audible, if the noise is audible and loud, they suspect its a hardware failure, i got my case id and will be taking it to the nearest service center here, for them to have a look.
so if u have a macbook that is under warranty dont hesitate to contact them. i guess even refurbished macbooks bought in online store also have a 1yr warranty.
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Quote from: HU16E on 11-April-11, 07:47:47
Have a look in your manual of the included accessories with your mainboard. Note the 'Back I/O Plate'.
For this I think you all are talking about the back panel right? One of the tabs is touching the exterior of the ethernet port. I assume it should be correct?
Quote from: sjay on 11-April-11, 07:48:46
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1. Try a Restart by pressing the sleep/lock button until you see the slider. Slide to power off. Restart by pressing the sleep/lock button until you see the Apple logo.
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3. Remove apps from Recently Used (multi-tasking) list...
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W510 makes a hissing noise

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