Before searching for a manual, look for a different alphanumeric string printed directly on the motherboard surface (often between the PCI slots). It typically looks like: (e.g., MS-7255, MS-7529) Model Names like Go to product viewer dialog for this item. or K9N Neo General Specifications for Boards with the N1996 Mark

Manuals for these older MSI boards are particularly helpful for resolving recurring user issues:

(most reliable):