JOE'S TECH — NO DISPLAY CHECKLIST
1. Confirm monitor power and input selection.
2. Connect the display cable to the dedicated GPU.
3. Test one monitor and one known-good cable.
4. Power off and unplug before opening the PC.
5. Reseat RAM and test one stick at a time.
6. Check GPU power connectors and motherboard debug LEDs.
7. Stop if you smell burning or see melted connectors.