The high pitched noise you may hear from a processor is so unlikely to actually be audible by humans that I am inclined to agree with Ghnader and Venj,
Remove the psu from the pc, plug it into the wall by itself, then short the green pin on the 20+4 connector with any of the black pins, the psu should start up,
do you hear the noise still?
post back your findings please to confirm/ eliminate this from the list
ps, you may have caused some damage to the processor when you unplugged the fan on the heatsink, you should never run a processor without its heatsink/fan.