Lenovo IS6XM Rev 1.0 is an OEM motherboard typically found in ThinkCentre M81, M91, and M91p
Intel HD Graphics (integrated into CPU) + 1 x PCI Express x16 slot Audio: Realtek ALC662 High Definition Audio Codec Network: Intel 82579 or 82579LM Gigabit Ethernet Controller 2. Essential Drivers for Lenovo IS6XM Rev 1.0 lenovo is6xm rev 10 motherboard drivers
Install this driver first before any other components. Intel HD Graphics Driver Lenovo IS6XM Rev 1