|I see an SiS 964 southbridge chip in pic 2...that tells me that you have a cheap/crappy motherboard.|
It appears that *most* of the pins are labeled so you can obviously rule out the SATA, CLS_CMOS, Speaker, IR, SPDIF, etc. My guess is the power, reset, HDD LED, power LED are all part of FP1. FP = Front Panel. If they're not indiviually labeled, find the motherboard model number then see if you can download a copy of the manual from the manufacturer's website. The manual will have a diagram of the front panel wiring.
BTW, clean the dust out of that friggin thing...it's disgusting!