No Boot/Random Power Failure

I bought a used HP Envy x360 about a year ago, had no problems for a couple months then one day while under minimal load it made a loud 'Click' and abruptly Lost power.

Then it wouldn't Turn Back on, When I would press the power button it would Flash the Caps lock light 3 times I believe and the power led was solid orange indicating it was receiving power. but I couldn't find any info on error codes for the m6-105dx anywhere so I started troubleshooting.

I opened it up and first disconnected the battery and plugged it in, no joy. I was angry so I went to sleep to try again in the morning. I wake up, press the power button and it starts to boot! I get to the HP splash screen and 'CLICK' Power failure... after the sign of life I try to access the bios and I use the Advanced Startup > Startup Repair It starts but about one minute in 'CLICK' and dies.

I then try turning it on again and I miss the chance to (ESC) the boot phase but to my surprise it starts to boot and does a automatic repair and then boots successfully and prompts me to sign in, I sign in and no problems for about 15 minutes then while I was troubleshooting checking for updates, monitoring task manager, looking at temps, ECT, it dies again.

Im !#^&@@ at this time and decide to go with the nuclear option and reinstall windows from the bios and delete everything. It of course dies half way through but I keep trying and eventually it completes successfully, I set up windows and after probably 45 minutes it 'Click' Dies.

At this point I move from software to hardware. I replaced the CMOS battery, No joy. I tried swapping the RAM to the other slot, No joy. I try Another slightly different but compatible Stick from another laptop, No joy. I downloaded the HP support assistant & the HP diagnostics Tool, I run some tests and it comes back with no issues. I updated some drivers while I was at it But, No joy. I ran Some tools baked into windows, They also came back with no issues. I searched for a bios update with the support assistant, It came back with nothing also.

I've run out of ideas, The only thing I haven't tried is swapping the hard drive because I don't have a spare, Although there's no indication anything is wrong with the hard drive from windows and I haven't noticed any out of the ordinary hard drive rattle. Although the hard drive states it was manufactured NOV - 2015, So its 8 Years old with no knowledge on how actively the drive was used before I bought the laptop, I never noticed it being especially slow for a HDD.

I'm not financially able to blow $500 - $1000 for a mid to high range laptop hence why I bought a used one. I've fixed some electronics before I'm not a idiot, however I'm not Linus Tech Tips and after hours of searching Youtube, Reddit and forms I haven't found a single person with the same problem and that combined with how seemingly random the problem is I cant pinpoint it, Sometimes it will last mere minutes before dying other times hours, I had it last almost 3 days once without it dying the only weird thing is it would put itself into hibernation mode after I closed the lid / Put it to sleep. Any idea's at all would be appreciated... Thanks in advanced!