Not ready for upgrade yet but need new motherboard

Right now I'm running an AMD Athlon 64 x2 4400 with an Asus A8N-E and 2 gigs of DDR memory. I'm thinking I have a motherboard problem since my sound card and onboard sound are suddenly not being recognized after a high pitched sound coming from the speakers. Since I can't just replace the motherboard with the same model I'm trying to find something compatible with my system to hold me over until I build an entire new system. I noticed that my cpu should work with the older AM2 motherboards but I would also have to purchase new ddr2 ram since my ddr ram will not be compatible. Am I on the right track here or am I missing something? So far I was thinking of.


ASUS M3A78-EM AM2+/AM2 AMD 780G HDMI Micro ATX AMD Motherboard - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E168...



G.SKILL 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory Model F2-8500CL5D-2GBPK - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E168...