for the RESET switch, make sure that it is hooked up to the mobo correctly, this could also have adverse effects on the rest of the system if it isn't. As for the computer not posting unless you clear the cmos, have you tried manually setting all the clock speeds, voltages, etc in the bios?
I have not tried manually setting voltages (It would be pretty sad if that was actually required to make it boot).
In a related question, when I do decide to try OC'ing where can I find the proper settings for each incremental increase as far as FSB/Voltages and even memory settings? - any good reference with specific information on my components?