Circuit diagram for the MS-7390 board at revision 0A, supplied as a 905 KB PDF. The MS-7xxx pattern is MSI's own desktop motherboard numbering, and 0A usually marks an early or pilot release. A technician can use these pages to trace supply voltages, find where a short originates, and check connector pinouts and the clock and reset logic. Early revisions often differ from retail boards, so compare the version printed on the PCB before you trust part references.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @pepeelectronica. Enginerys does not host this file.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.