The CPU fan header is proprietary 5-pin (not standard 3 or 4-pin PWM). It uses a combination voltage and tachometer sensing that standard fans cannot read. Without an HP OEM fan, the system will throw a "FAN FAILURE" error and may shut down after 30 seconds.
The BIOS contains a microcode whitelist. Even if a Core 2 Quad Q9650 fits physically, the board will beep and fail to boot. Only CPUs listed in HP’s official quickspecs for the 8767 series will work. Safe bets include: E8400, E8500, Q6600, Q8400. hp 8767 a -smvb- motherboard
To test a used board, you need an HP original power supply (e.g., P/N 709879-001) or a $15 adapter cable (HP 6-pin to standard 24-pin). The CPU fan header is proprietary 5-pin (not
series PCs. It is designed for 10th Generation Intel processors and uses a proprietary power connector, meaning standard ATX power supplies will not work with it. HP Support Community Key Technical Specifications Intel H470. Form Factor: Customized (approx. 11.45 x 9.17 inches). 2 DDR4 DIMM slots. Expansion: 1 PCIe x16 slot (PCIe 3.0). 1 PCIe x1 slot. The BIOS contains a microcode whitelist