The first thing that hit me is the odd memory combo.
I always tell people if you're going to have two sticks of memory, make sure they are identical, even if the mobo manufacturer says it is not imperative. DDR2 is dual channel memory meaning you have two white slots and two black slots (or two purple & two orange in this case), the two sticks should be both in the orange slots and "equal". Meaning "same make & model & size".
I highlighted your mobo specs & stuck them into the google search field and this is the first link I looked at, look at what people say about memory usage.
Also, this is an economy class mobo, you get what you pay for. It does not supply enough power for the processor it supports (shy of one 4 pin power connector). And there may be a heat issue at hand here if there is not enough cooling (Case fans), as there is only one 3 pin fan connector, this type of processor should have at least two case fans in a relatively cool setting, and a good quality heatsink and fan on the processor.