Ms-7613 Ver 1.1 Motherboard Manual -

That was the twist. The manual wasn't a standard retail guide. It was an OEM (Original Equipment Manufacturer) blueprint. MSI hadn’t made this board for enthusiasts to tinker with; they had built it specifically for Hewlett-Packard, likely for a Pavilion or Compaq Presario tower. That explained the non-standard layout. The power connectors were placed in awkward corners, and the front panel header was a proprietary block of pins rather than individual headers.