Well that may be the problem then... because recently i was complaining about the noise of my pc to my friend. so he snooping around the fans and unplugged some that were making alot of noise.. after adjusting my fans i started to have those sound problems..ill put them back in and see if this fixes the problem...wish me luck!
Another thing i found is this ....
http://www.pcmech.com/show/troubleshoot/743/
This might help out?
I'm going to try this if my idea doesnt work
The Realtek AC'97 Onboard Sound - Real Sound-Outs, Real Problems!
Introduction:
In recent times, motherboard's feature a wild range on onboard features, such as Gigabit LAN or USB 2.0 ports. However, the Realtek AC'97 onboard sound is a consistent feature included on motherboards supporting Intel 875 and AMD Chipsets. Whether or not you decide to use onboard sound, or a dedicated soundcard, the Realtek AC'97 is a component that can cause menace and frustration, when the proverbial hits the fan.
What is The Realtek AC'97?
The Realtek AC'97 chipset is most commonly found on motherboards with the AMD or Intel 875 Chipset. The Realtek AC'97 is a versatile chipset, baring the distinguishable "AV rack Crab" on its chip. It's a great little sound chipset that can process EAX, 6 channel sound and all with the compactness and conceivability of onboard sound. However, when the Realtek AC'97 AV Rack Crab decides to get "crabby" things can turn pear shaped, and provide months of frustration and hassles, all over such as small, but crucial component of your PC.
The Problem and Symptoms:
The Realtek AC'97 is red flagged in forums and help desks at this current time, in regard to an issue that involves the sound to "drop out". This kicks in approximately 5 to 20 minutes into a game or application, causing the sound to permanently mute. This problem, which I have personally experienced, is incredibly frustrating as it is hard to locate and trouble-shoot the problem at hand. However, in my case and may other users, the answer lies in the motherboard itself…
The Resolution and Explanation:
Most Intel and AMD motherboards (depending on your motherboard brand and revision number) have the option of using the onboard rear audio jacks, or if the computer case meets requirements, the possibility of using a front MIC and headphone input/output. Respectively there are jumper pins on the motherboard, designed for the connection of external audio jacks, which sometimes are missing jumpers or been previously removed for a front panel install.
In order to fix the "drop out" ensure that there is a jumper on the Speaker Out and Speaker Out Return pins. There should be a pair, corresponding to a channel of audio. So, if you have a Left and Right channel, there will be a Speaker Out and Speaker Out Return for the Left and Right channel. However the only drawback is that this resolution disables any attachment of a front audio jack for Headphones or a MIC. Ideally, if you do not use any front panel audio connection or if your case doesn't allow an option to, you can simply make sure to check that there is jumpers on the Speaker Out and Speaker Out Return. This enables you to use your speakers that are attached into the audio jacks on the rear of your computer as normal, thus no more "drop outs".
The "drop out" is caused in the jumper assignment itself. The motherboard has a semiconductor chip dedicated to sound distribution (aka. the Realtek AC'97 chipset). The jumpers allow the connection of a front audio jack, or by default, a rear stack of audio inputs/outputs provided by your motherboard. If those jumpers aren't correctly installed on the pins, or the front audio panel has some issues, a circuit is not formed correctly, causing the motherboard to "time-out" its cycles of audio. Thus, by disabling any variables to the audio circuit, there is less is likely for anything to go wrong. Also, updating to the latest version whilst doing so, will remove more variables, such as defective driver install or release.
The Conclusion:
Overall, the Realtek AC'97 is a great onboard sound device, providing that it works. The above method to fix the Realtek AC'97 from "drop outs" may not apply, as a similar and more severe cause to "drop outs" include motherboard failure, a blown or overheating Realtek AC'97 chip. At the worst, it results in an alleged fixing method of attaching a Heat Sink to the top of the Realtek AC'97 chipset. Regardless, this Quick fix 101 is designed to help you refine the problem with your Realtek AC'97, eliminating the hidden yet obvious "sound outs" with the Realtek AC'97 chipset.
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