I just finsihed building a new computer with a MSI P55 GD65 mobo and an intel i5 cpu. The idle temp is around 40c but under load or when checking the bios it gets between 70-80c. I have an Antec Nine Hundred Black Steel ATX case with 2 front fans a back fan and a top fan. The bottom front fan is not plugged in but that should not cause this much overheating. The power supply, graphics card (GeForce 9800 GTX) and aftermarket heatsink (Scythe Ninja Mini Rev. B) all have running fans. All case fans are set to medium. I would like to know where I should start looking for issues, and also if it is ok to take off the heatsink to see if it attached correctly (smudged the thermal paste). Also, the GPU and CPU are pretty close, I was wondering if it would be better to put the GPU on the other PCIE slot that is farther away (does it matter which slot the GPU is in?). Thanks!