Is my 9800X3D dead ? 3.20 BIOS X870 Pro RS.

Update: Can confirm the 9800X3D is dead. See Edit 2

Video: https://youtube.com/shorts/gwpmqw_bPEY?si=vBuVn1NPJcBoDigE

So while playing KCD2, my PC just shut off and doesn’t turn back on anymore. When I try to turn it on, the case fan and motherboard light up for a split second and the nothing, interestingly, any subsequent power button press does nothing. If I unplug everything, wait a while, plug everything back in, it behaves the same, split second light up, then nothing.

So far I’ve checked my CPU, no visible sign of burn or other damage Unplugged all PSU cable and plugged back in to make sure they are all seated correctly. Did a PSU paperclip test and my PSU seems to be fine (fan is spinning normally)

I haven’t seen anyone mentioning this specific behaviour I outlined above, it seems most dead CPUs gives out error LED on motherboard and doesn’t POST. But mine doesn’t even turn on (apart from that 0.2 seconds you can see on the video).

Been using this system with a 6700XT since January, did a BIOS update to 3.20 when it came out. Last Friday switched to a RTX 5090 and now my PC is dead. Can someone help if this is another dead CPU issue?

Spec: 9800X3D ASROCK X870 Pro RS RTX 5090 (only got it last Friday) DeepCool PX1200G 1200W PSU

Edit1: just tried to flashback the 3.06 bios which was the one it shipped with. The system still doesn’t turn on at all.

Edit2: welp.. got a cheap 8400F to test and my system booted just fine. So I can confirm the 9800X3D is the only thing not working here. Here is a video proof: https://youtube.com/shorts/xVzjQ94BsLY?si=mUBtt1knYrhd6Hvb (don’t be concerned with the lack of cooler, I only powered on the 8400F for 1-2 seconds and unplugged the PSU.)