Red light activated on the B660m Pro DRAM
Red light activated on the B660m Pro DRAM
That's typical. The LEDs show the stage of the startup sequence, which can help with diagnosing issues.
You're experiencing a monitor freeze while the PC remains powered on, and the red light indicator isn't activating. It seems unrelated to RAM—likely a display or power issue.
You're correct to verify compatibility on the site. Since it's listed as supported but not QVL, it's fine to proceed unless you have specific concerns. If you're unsure, you might consider getting an alternative model.
You noted that only RAM slots 3 and 4 are functional. This likely means channel A (slots 1 and 2) is non-operational. If you insert a single RAM stick into slot 4, will it start up correctly? If it boots normally after installing RAM in slots 3 and 4, remove both and attempt a single stick in slot 2. If that succeeds, proceed to slot 1; if it fails, remove the stick from slot 2 and use only slot 1.
It might explain your issue or not. If I were in your situation, I’d swap it out.