|"I believe it's DDR2 4 gb"|
The A8N-SLI uses DDR, not DDR2.
"I keep my side case open for more airflow"
Keeping the side panel off reduces airflow.
"constantly replace the thermal fluid on top of my CPU"
Thermal fluid? Is your CPU liquid cooled? If you're talking about thermal paste, it only has to be done once & if it's done correctly, it never has to be done again unless you remove the heatsink for some reason.
All you need is a tiny dab of paste about the size of the grain of rice & it should NOT be spread around. If you use too much, the heat from the CPU won't transfer to the heatsink properly & the CPU ends up overheating. Just put a small dab in the center of the CPU, then lock the heatsink in place...that's all there is to it. Here's the instructions:
"my keyboard won't fire up!"
USB? Get yourself a PS/2 keyboard or try a USB to PS/2 adapter.