Help! My PC Won’t Boot After Adding More RAM

You might want to try clearing the CMOS. Insert all four sticks, then unplug the power supply and press the power button to drain residual power. This can help reset things. Be sure to match your RAM pairs as specified in your motherboard manual, and give it at least 15 minutes after that to retrain the memory before booting up.

Checking that your BIOS/UEFI is up to date can solve a lot of issues too. Forcing your CPU’s memory controller with four DIMMs can be quite a stretch, so don’t lose hope just yet!

Running four sticks of DDR5 can be tricky for many motherboards, especially if you mix kit types. If all your RAM is from the same Corsair Vengeance kit, that's a good start. Have you tried reseating them? Sometimes it's just a matter of fitting them correctly in the right slots.

It can be pretty demanding to run four DIMMs with DDR5, particularly if EXPO is enabled. You might need to disable any overclocking settings and try starting with lower speeds. If you can't get all sticks to work, consider the option of switching to a 2x32GB setup since that should be plenty for gaming and content creation.

If you've tried all that and it still doesn't boot, it could be a sign of hardware damage. I've fried a few boards myself in the past, but I wouldn't jump to conclusions just yet. Sometimes it just takes multiple attempts to boot correctly, especially when dealing with memory configurations.