I recently purchased parts for a new computer. When I boot it, it fails to POST, giving 4 beeps, no video, and no USB power whatsoever. All fans and LEDs run. Upon removing all components but the PSU, CPU+HSF and Motherboard, the same beep code occurs. Using all possible sets of components (1 ram tried in each slot, both ram no video card, video card no ram, etc.) gives me the same exact beep code. I flushed the CMOS, same issue. Upon removing the CPU, the systems boots for a moment and shuts off entirely, leading me to the slight possibility of a Power Supply Issue.
I know for certain it is not the motherboard as I have swapped motherboards, and I cannot test the current power supply as the only other computer I have available is rated for 900+ Watts and the PSU is 550. I could, in theory, test the processor in my current computer but am lacking thermal compound for when I put it back in my current computer.