How do I diagnose this issue?

I just built this PC and I’ve tried all the advice I could find online but the diagnostic LED still flashes green with A2, saying IDE detect with no output to monitor.

I’ve checked all cable connections, ran with only one RAM, removed all drives, removed the CMOS battery, not using any SATA cables in the first place, but still stuck here. What am I missing?

Specs: - CPU: Intel Core Ultra 7 265K Arrow Lake

- GPU: NVidia RTX 3090

- Motherboard: MSI Z890-A PRO

RAM: G. Skill Ripjaws S5 (2 x 32 GB) DDR5