Hello, When you tryed the corsair or the Samsung memory and the system refused to boot did you hear any beep code or flashing light ? The led that is used to indicate the battery status is also used to let you know about issues when the system is unable to display an error message read the "system diagnostic lights" section of this manual (page 66).
I'm having an issue during ram upgrade on new Inspiron 16 plus PCs with 3rd party RAMs. the model's major spec is "17-12700H, 16GB (8GB x2) DDR5 4800 RAM, nvidia 3060 GPU". the RAM was need to be upgraded to 32 GB. First time, I tried Corsair Vengence 32GB kit (16GBx2, DDR5 4800), but the PC didn't boot. so I returned the RAM and ordered new RAMs from A-Tech's. the new RAM stick was made by SAMSUNG which was same bender of the original ram modue, so I expected no issues on it. But this second try turned out same result with the first try. So I wonder if this laptop can be upgradable with 3rd party RAM module or not. And more awkward thing is, it won't boot even just swapping positions of the original ram modules only (not new RAM modules), I have tried service mode too, but same result. Is there anything I'm missing here? to summarize my points are.. 1. Is the RAM upgrade on this model possible or not? 2. If the above 1 is possible, what is the cause of my failure? 3. if the failure is caused by compatibility issue, what is the compatible 3rd party DDR5 4800 RAM for this model? 4. And this is just curiosity of mine, but why won't it boot when swap their positions of the original memory sticks?   thanks.  
ram upgrade issue for Inspiron 16 plus (7620, 12700H, 16 GB DDR5 4800 (2x8G), 
3060)