G31M3-L V2 won't boot with two RAM sticks

I'm building a computer (first build) and am using an MSI G31M3-L V2 motherboard.
I have 2 x 2GB sticks of G.Skill DDR2-800 (PC6400) RAM, but the motherboard will only boot if I use one. Either stick works, as long as it's in the RAM slot closest to the CPU. If I put a stick in the second RAM slot, the fans spin up and the DVD access light blinks a few times, but the monitor doesn't wake up. Ctrl+Alt+Del does not reboot, and the power button doesn't turn it off, it has to be unplugged (or switched off at the PSU).
I've tried flashing the bios several times and resetting the CMOS jumper, but it still doesn't work. Should RMA it? Any help would be appreciated.
Thank you.

Quote from: Henry on 22-February-09, 10:34:05
One thing needs to be made clear is that with only 2 memory slots on that MB, single channel is with 1 stick installed and dual channel is with 2 sticks installed, simple as that. There is no BIOS or OS setting to change that.
Well then that doesn't make sense then. If I have two sticks in totaling 4GB installed, it runs very slow. According to this:
• Due to the limitation of G31 chipsets, dual channel support must meet some requirement in the specification of memory modules. please refer to Test Reports for detailed description.
My system MAY be running in single channel mode.
BUT
If I take out 1 stick of 2GB totaling 2GB installed, then it runs 20 times faster. Here I am running @ single channel mode. So if the above is true and both configurations are running in single channel mode, why does it run so much slower with 4GB instead of 2GB?

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squeakmaster, welcome to Apple Discussions.
Have you tried the following with one 512MB RAM stick:
1. Palce it in the first RAM slot. Does the Mac boot?
2. If so, remove the stick & place it in the second RAM slot. Does it boot?
3. If so, remove the stick & place it in the third RAM slot. Does it boot?
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Do this with each of the tree RAM sticks & post back the results.
When the logic board was replaced, was the firmware updated to be compliant with OS X. (Note - The firmware is installed on a chip on the logic board.) Check your Mac's firmware (Boot ROM version) version. Mac OS X: Available firmware updates
http://docs.info.apple.com/article.html?artnum=86117 If an update is required, the update must be installed (using OS 9) BEFORE you install OS X.
Can you boot up in OS 9.x? If so you can use DIMM First Aid - Check & recover disabled (missing) RAM from Apple's latest firmware updates http://www.versiontracker.com/dyn/moreinfo/macos/10415
 Cheers, Tom

MOVED: MSI Z97 won't boot with 4 ram sticks installed!! Motherboard pls

This topic has been moved to GAMING Motherboards.
https://forum-en.msi.com/index.php?topic=253593.0

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<table border="0" align="center" width="90%" cellpadding="3" cellspacing="1"><tr><td class="SmallText"><b>haroldkarl wrote on Sun, 22 January 2006 12:03</b></td></tr><tr><td class="quote">
the little riser are for is for a sound card... the same one that the Sparc 4 uses... hard to find... the others are "Elite3D-m6 assembly <=540-3058-06 is not compatible with the A20." a horizontal version of the Elite3D-M6... also hard to find.
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</td></tr></table>
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Click the "Accept as Solution" button if I resolve your issue.

G31M3-L V2 won't boot with two RAM sticks

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