I recently put together my first build, but had to take out the motherboard so I could send it back (I bought the wrong one by mistake and didn't realize it until I had everything installed). I only had the computer running for about 10 seconds so I could see if I had a monitor signal. When my new motherboard arrives, do I need to reapply thermal paste to the cpu/heatsink? I just used a stock heatsink, so I didn't need to worry about applying thermal paste the first time around.
Here's a pic of what the cpu/heatsink look like right now: http://i67.tinypic.com/296oksg.jpg