1x PCI Express x16 (for GPUs) and 3x PCI Express x1. Storage: 4x SATA 3.0 Gb/s ports (SATA II). Rear I/O: HDMI, VGA, 4-6x USB 2.0, and Gigabit Ethernet. Where to Download BIOS Updates
Reinsert the battery, close the case, plug it back in, and try to power on. 2. Move the RTCRST Jumper dell mih61r mb 100971 bios upd
The easiest way for most users is to use Dell's built-in support tools: How to Update BIOS: Install and Upgrade BIOS on Windows 1x PCI Express x16 (for GPUs) and 3x PCI Express x1
use a BIOS for a different Dell system (e.g., OptiPlex 790) — wrong checksum will fail. 4-6x USB 2.0