hi Thanks for your replies on "suggest motherboard". I bought MSI K8MM-V. its working fine under linux. But my GIGABYTE Optical Mouse (GK-6PB) is not working under linux. Its works under windows. My friend has DEXXA optical mouse, it works fine on linux on my system. But the gigabyte mouse behaves the same way on my friend's pc. I tried it on Kubuntu (breezy) and Knoppix 3.9. I would be grateful if somebody can suggest me a solution. Manish