Take the mobo out of the case and put it on either a wooden or cardboard surface and try starting it. You will have to jump the leads for the power switch.
Also, strip it down to the lowest factor and only have the CPU in it. If it spins up then kill it and add the RAM. Continue until you find the culprit. it may just be grounding out tot he case, though.
Also, strip it down to the lowest factor and only have the CPU in it. If it spins up then kill it and add the RAM. Continue until you find the culprit. it may just be grounding out tot he case, though.