I'm having a problem where the system will not POST or display video if there are sticks of RAM in slot B and/or C of the motherboard when using the Thermalright HR-02 heatsink. I've tried many scenarios and have found that the system will boot if:
The heatsink is held in place without the tension bracket, no pressure applied
The tension bracket is barely on, almost like it's just making contact with the screws
The heatsink's mounting hardware doesn't seem to be touching anything except the metal plate behind the motherboard. The system does not seem to boot if enough pressure is applied, no tension bracket in. I really can't make sense of this because it boots up just fine with one or two sticks of RAM in the first two slots. Note that the system boots up fine with the stock cooler. I've tried booting with all the auxiliary power connectors in and none, but no results.