MXM slot for removable NVIDIA Quadro or AMD FirePro graphics. Memory: Typically 4x DDR4 SO-DIMM slots.

| Source | Search term | Likely result | |--------|-------------|----------------| | (ex-HP/Agilent) website | LAC391P service manual | May have PDF under "obsolete products" | | Artek Media (manual seller) | APW70 schematic | High-quality scan of original | | ElektroTanya (free) | HP APW70 diagram | User-uploaded service manual | | KO4BB (HP/Agilent archive) | LAC391P | Large collection of old HP service docs |

Inspect power phases near the MXM connector (including the aforementioned component). Bios/EC Issues: Corrupt firmware can lead to "fans spin, no display." Look for the 8-pin SPI Flash chip near the PCH. 📥 Where to Find Schematics