Something sounds wrong to me... I don't think that the HXXX series can do passive cooling... Here for example they found that "Without any active cooling fans the temperature rose to a dangerous level and so in this test it failed" - although this was with a LGA2011 CPU... What are your temps like
Thanks guys. Took my rear side panel off and stuck the lead into another connection and now working normally. Think maybe my PSU is starting to play up, thank god I have a spare.
It was weird as i was watching it run normally then now and then just stop running and then come on like 5 minutes later.
For the Corsair H series coolers, you really really should set up the fan profiles in the BIOS. Depending on which generation of cooler you have, you need to plug the pump connector into either the CPU_FAN connector or the CPU_OPT Fan connector. Then in the bios, you need to set the CPU Fan Speed Low Limit to Ignore, the CPU Fan Profile to Manual, the CPU Fan Max Duty Cycle to 100% and the CPU Fan Min Duty Cycle to 100%. That makes sure that the pump is always running at full power. The actual radiator fans should be plugged into the H100 pump body, so that it can control the fans via PWM.