You have an older Socket 775 motherboard that does not have SATA 3 6Gb/s capabilities. It only has SATA 2 3Gb/s capabilities. Although SATA 3 is supposed to be backward compatible with SATA 2 there are some of those older socket 775 boards that do not play nice with modern 3rd generation ssd's.
Unfortunately your motherboard is no longer in production and the MSI product page is no longer available at the MSI web site. Luckily Google is my friend. Here is a link to all the MSI downloads and updates for your motherboard:
http://www.msi.com/product/mb/G31M3-L-V2---G31M3-LS-V2.html#/?div=BIOS
There is a "download" tab that opens a drop down menu with download sections for the BIOS, drivers, and utilities. I suggest you try downloading and installing the BIOS and Intel chipset driver updates. It may or may not work.