RAR archive for the MSI MS-7715 motherboard, retail model 870-C45, marked revision 10, about 1.79 MB. The 870 in the model name points to an AMD 870 chipset board. The contents are not named, so extract the archive to see whether it includes a schematic, boardview or both. Check that the PCB carries the MS-7715 code and the matching revision before relying on it, then use it to follow CPU VRM circuits, chipset rails and power sequencing when tracking down a no-power fault.
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 @IT_SERVICE_WORLD. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.