@lpb007 posted:A short may have damaged the board, but how could a short damaged a LED??
Pretty simple really. The LED is directly powered by the RCMC, but the RCMC does NOT have a common AC and DC ground. So, grounding one side of the LED could have put way more voltage on the LED than is is rated for. Grounding ANYTHING on modern Legacy or any MTH PS/2 or PS/3 boards is very bad for the health of the boards and the parts.