So my system has power (if I plug something into usb it has power) but won’t turn on. At first when I pressed the power button the side fan (not the cpu fan) would spin a couple slow cycles and the power light would blink dimly before it died. Now there’s no response. From just looking at it without taking anything out, it appears fine. I have been noticing a slight burning smell (not really burning but more of a smell of heat) and cleaned out a lot of dust, which seemed to help the smell. Is my cpu dead or could it be something else? How would you troubleshoot/fix?