There are BIOS updates to fix memory incompatibilities.
which BIOS version do you have. Current is 1203.
You board supprots has crash free BIOS feature. Read the manual or website on how to update and use this feature if you have an older BIOS version.
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ASUS CrashFree BIOS3
The ASUS CrashFree BIOS 3 allows users to restore corrupted BIOS data from a USB flash disk containing the BIOS file. This utility saves users the cost and hassle of buying a replacement BIOS chip.
ASUS EZ Flash2
With ASUS EZ Flash, you can update BIOS before entering operating system. No more DOS-based flash utility and bootable diskette required.
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Also
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*DDR2 1066 is supported by some of the AM2+ CPUs only. Refer to ASUSTeK Computer for the supported CPU models.
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ASUSTeK Computer Inc. ASUSTeK Computer Inc.-Support-
It would be best to look at their support website and find tested compatible memory and purchase four gigs of the same and sell what you have.