MacBook sound not working.

Hi, for Christmas I was given a new MacBook Air, and the sound was working fine, I would litsen to music both with headphones and with the built in speakers, but now neither one works. Please help!

The warranty entitles you to complimentary phone support for the first 90 days of ownership.
If you bought the product in the U.S. directly from Apple (not from a reseller), you have 14 days from the date of delivery in which to exchange or return it for a refund. In other countries, the return policy may be different. If you bought from a reseller, its return policy applies.

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AUDIODG.EXE hogging 80-100% of CPU and sound not working in Vista . . .

I posted this on a Microsoft Answers Forum but none of the techs or people reading have been able to help so far. I'm dying to get to the bottom of this:
Here is my computer:
MSI K8N Neo4 Platinum
AMD Athlon 64 3000+
2GB RAM
XFX GEFORCE 6600 GT 128MB DDR3 DUAL DVI & TV OUT (PCI-E)
200GB WD SATA HDD
500GB WD HDD in external enclosure via USB2
NEC ND-3520A 16X DVD±RW Dual Layer DVD Burner
LG CD Burner
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I've had a Sound Blaster Live! card in my computer for some time but I was not using it; I use the Realtek AC'97 audio drivers that are on my motherboard instead. I thought that the conflict may be the computer wanting to recognize my Sound Blaster, so I took it out of my computer but the problem seems to be worse.
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REPLY #1:
Thank you for using Microsoft Answers forum. I suggest going to the manufacture of your sound card and download the latest drivers and install them.
MY RESPONSE:
Good suggestion. The problem is this:
I am running on-board audio. I have an MSI K8N Neo4 Platinum motherboard which runs "Realtek ALC Series AC97 Audio Driver" and there is no version for Vista. They have a version for Windows 2K/XP and one for Windows XP 64bit.
Should I use on of those and if not, then what?
UPDATE (from me):
I took a chance and found a Realtek AC'97 driver for Vista.
http://drivers.softpedia.com/progDownload/Realtek-AC-97-Audio-Codec-Driver-Vista-6183-Beta-Download-18114.html
I went to install it and the install hung. So, I closed one of the install windows and then the InstallShield app continued like it was working. So, I hit "Restart my computer". Well, the reboot hung too. So, I reset the PC manually.
When the computer came back up, the sound worked. Hard to tell if this will fix it for good but it's promising. Chaotic. Unpredictable. Annoying.
REPLY #2:
Before you tried updating drivers, did you try rebooting 1st?
I'm just trying to determine if rebooting your system is what resolved the issue - thank you
UPDATE II (from me):
My computer is behaving the same way it was before. AUDIODG.EXE taking up 80-100% of my CPU and the sound not working.
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http://forums.techarena.in/windows-vista-performance/1012315.htm
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cedricganon wrote:
Ive tried all those options but nothing. Device manager also says it is Creative SB X-fi. whats also suspicious is that if i use the sound card built into the motherboard, i get the same problem.
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Message Edited by boon2 on 05--2009 09:44 PMMessage Edited by boon2 on 05--2009 09:5 [email protected]

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