No Sound After RAM Upgrade

Hi. I'm having a little issue. I think this might be a long read so please bear with me as i try to explain this as best as possible.

I have only 2 RAM slots ( not planning to upgrade anytime soon ). I have 3 RAMs though.
1 x 2GB | 1 x 1GB | 1 x 512MB

Whenever i have the 2GB together with 1GB, i'll have no sound.

2GB + 1GB = No Sound
2GB + 512MB = Sound Works
1GB + 512MB = Sound Works

I've switch slots and it doesn't work too.

My Motherboard is Biostar P4M90-M7A. I'm using an on-board sound card ( Realtek HD Audio ).

When i have my 2GB + 1GB, everything is gone from Playback Properties ( except for my USB sound card ). - Refer to image 1
Right now, i have my 2GB + 512MB and sound is back to normal - Refer to image 2

I've tried reinstalling my sound card driver and it doesn't work.

Need to point out that all 3 RAMs are identical in brand, model, etc.

Any solutions would be helpful.


Cheers

Have you tried switching slots with the 2 gig and 1 gig sticks.
I see that you have....

What model mobo do you have?
Is this a branded PC or a custom build?

baarod said:

Please screen shot of device manager with 3gb installed?

It's not that easy right now. But last night when i had 3GB installed, i did take a look in Device Manager and there's no 'yellow mark' anywhere. And under audio, there's only "USB PnP Sound Device".

bassfisher6522 said:

What model mobo do you have?
Is this a branded PC or a custom build?

TGSoldier said:

Can you list the right motherboard model please?

It's custom build. No brand.
Sorry about the mobo. I just found the package box and here's the right model.
Biostar P4M900-M7 SE - BIOSTAR :: P4M900-M7 SE :: Specification

On the site, it shows v7.x but when i checked mine using Belarc Advisor, it says v1.0. Model number is wrong too.

Somebody? Anybody? Everybody?

Some help would be nice.

Dj SharK said:

Somebody? Anybody? Everybody?

Some help would be nice.

No promises... but you sound so desperate

If you are running x-86...

Grab a copy of Ultimate Windows Tweaker, a TweakUI for Windows 7 & Vista | The Windows Club There's a lot of good tweaks and settings in it. In particular at the bottom of one of the pages is a tweak to enable more than 2gb under x-86 Windows. What it does is remap the I/O space a bit higher in memory so there's no collision with installed ram.

CommonTater said:

If you are running x-86...

Grab a copy of Ultimate Windows Tweaker, a TweakUI for Windows 7 & Vista | The Windows Club There's a lot of good tweaks and settings in it. In particular at the bottom of one of the pages is a tweak to enable more than 2gb under x-86 Windows. What it does is remap the I/O space a bit higher in memory so there's no collision with installed ram.

Good call CT! The 3MB combination and the audio device are likely fighting for address space.

-----If possible, disable Dual Channel memory support in the BIOS.-----

Has the OP checked to see if the 2GB & 512MB chip combo are actually showing up as 2.5GB RAM. Also, BIOStar is not known as a high end Motherboard.. the I/O chip programming may just have a problem with the 3GB combination.

Ap

Aphelion said:

-----If possible, disable Dual Channel memory support in the BIOS.-----

Also a good call. I have a BioStar socket 939 motherboard and it ONLY runs in dual channel mode. There's not even a way to disable it in the BIOS. However, when I saw the OP has already tried a mismatched pair of modules, I concluded the dual channel mode wasn't the issue, so I didn't post that suggestion.