Around 2 weeks ago my pc was having issues with it crashing, blue screening and after it crashed, I tried to boot it up but the fans spun for a few seconds then it powered down again. I originally came to the conclusion that it was having PSU trouble with power spikes, so I replaced my power supply for a new one and just to make sure I alse reapplied thermal paste to my cpu. This actually fixed my problem for that day, and I made sure it wouldn't crash by leaving It running while under some heavy load, this worked fine for 2 days, then it just completely stopped working altogether. I tried resetting the cmos and resitting ram but it did nothing to fix it, I also tried reaching the cmos battery, considering it was a few years old, but still nothing. I now think it could be my motherboard but I was looking on here for help before I plan on replacing it. Any thoughts?