21crescendo

Thanks for the reply. I come bearing positive developments! My PC works absolutely fine now! What I did to get it working was remove the CMOS battery for 30 seconds and put it back again. Booted up to the same issue. Tried again, this time with one RAM dimm less. Same result. No boot and intermittent shut offs. Finally, I unhooked the GPU, plugged in the HDMI direct to the processor, and turned on the power switch with just one RAM dimm. And sure enough it did the trick. I then put it all back together and powered up. I had to reconfigure my BIOS settings like boot device, turbo boost and XMP memory. Lesson learnt. 20/20 hindsight I guess. Just thankful to have my PC back. And I'm super grateful for the comments, truly. Thank you.

So, until this morning everything was working fine. That's when I noticed a slight bend in my GPU when I decided to take off the case window and fix it. The PC was turned on at that moment and I was able to fix it. That's when I noticed some light dust on the top of the GPU backplate, I then proceeded to brush the dust away. Sure enough I was able to do it, but upon my last brushstroke, I either touched a connector or a pin or a circuit or something and my PC abruptly turned off. My impulse was to check the surge protector on the wall socket and it was fluctuating for a bit. I removed all electronics from it (monitor, speakers and PSU power) and tried it to plug it in directly to the wall. It still wouldn't boot properly, just would intermittently have power for a second and turn off momentarily. I have tried to reset CMOS on my motherboard by removing the battery. The video I have posted is immediately after resetting CMOS. Power is being drawn directly from the wall. PC turns in intermittently, mobo, fans, GPU etc. Only the PSU fan doesn't turn on at all. My guess is that the PSU's days are done. Any thoughts, suggestions? Specs are listed in my profile.