So, I cleaned up my old PC after building this new one, repasted the CPU, cleaned out some dust, cleaned up the fans, and put it together with a PSU from another computer. Problem is, when I try to turn it on, it powers on for like a second or two, then powers off with the LED blinking, fans spin, but stops when it powers off. If I unplug it and try it again, eventually it tries to boot, I can get to BIOS, but then I get to the booting windows screen, be it the installed OS on the HDD or trying to boot the USB flash drive to reinstall and it powers off, with the power LED blinking.
Any ideas?
Any ideas?