Gigabyte GA-H81M-DS2 motherboard archive, a 1.57 MB ZIP whose name gives no revision or file description. This is an Intel H81 micro-ATX board, and the package probably contains service drawings or firmware, so check after extracting. A schematic or boardview helps you locate the power-stage MOSFETs, the PWM controller and the standby logic, and trace why the board fails to start. If a BIOS dump turns up, back up the onboard SPI flash first and confirm the image size matches the chip.
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 @cyberlanelectonik. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.