RAM issues with K7N420

I bought two extra sticks of 256 MB DDR 2100 RAM and I've installed them into slots 2 and 3 (along with the original 256 I had in slot 1) and the system doesn't recognise that they are there.
I read the manual and it shows in the appendix the configuration for 768 MB as 512, 256, 0 MB for the slots.  I've got 256,256,256.  I don't see why that's a problem.  Anyway, I pulled the one stick out of slot 3 and it didn't make a difference.
The manual also says not to put dual load or dual bank memory in slot 3.  What's the difference between single load and dual load memory?  
Any reason the computer isn't reporting the extra memory?  
Also is it normal for the computer to cycle through the memory test 3 times?

macoombi,
You can improve your system performance by using two matched sticks of RAM.  Use either Dimm Slots 1 & 2 or 1 & 3 to get Twinbank going.
512Mb of RAM is more than enough RAM for 99.9% of the users out there.  Adding more RAM slows the system down and does little more than give bragging rights. (Unless you use huge programs for Music or Video Editing.)
Good Luck,
Richard

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    Video Card: NVIDIA GeForce 9800 GTX/9800 GTX+ (EVGA)
    HDD:  WD 74gig raptor, WD 160gig
    If i should update what can i do to make sure it goes as smooth as possible?  Any help at all or a link to something helpful would be great thanks!

    Yes, it is a BIOS detection problem. Update it to v1.5 to solve the problem.
    http://www.msi.com/index.php?func=downloaddetail&type=bios&maincat_no=1&prod_no=1846
    Please >>Use the MSI HQ Forum USB flasher<< to flash your BIOS.

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