What component is broken in my system

mobo: gigabyte ga-p43t-es3g

memory: G.SKILL Ripjaws X Series 8GB ddr3 1600 http://www.newegg.com/Product/Product.aspx?Item=N82E168...

cpu: intel core 2 extreme qx9650

gpu: ati radeon hd 4870

psu: thermaltake puerpower 600w

the above system was working overclocked for a couple of days until i decided to try to overclock further. i was frustrated and was messing with a bunch random settings. i think the last one i changed was no-execute memmory protect. basically it failed to post and i switch the psu switch to off. then i tried to boot again...repeated fast beeps then system powers off and repeats(says power issue in maual). cleared the cmos by shorting pins beeps. took out battery unplugged system for over a day beeps. tried using one memory at a time in all slots beeps. if i take all memory out it gives me SLOW beeps. i know the psu not to be the culprit as im using it to power the system im writing this on. i read on another forum that someone didnt seat the memory properly and it gave them these error beeps. basically i need to either replace the mobo or the ram and would like a second opinoin before i rma my ram or its the mobo fault and i probly wont get another one and keep my ddr2 mobo.

thanks