I removed the video card and MEMORY and tried booting.
So I have nothing but the cpu, and everything else disconnected.
I get 3 beeps on the speaker which means:
"First 64 K memory failure" according to my motherboard manufacturer, which make sense. So something is working a bit.
The CPU fan stays on, so does the power supply fan and case fan.
I tried putting back in one of the DIMMS, failed, no beeps.
Then replaced it with the other DIMM. Failed, and no beeps.
Maybe I cooked the DIMMS when I tried booting with only the main motherboard power connector connected, while leaving the 4 pin 12v connector off, which results in that constant long beep????