I voted total pump failure - but take that in a "I forgot to plug it in and so it wasn't working" failure type of way. As I explained in your other thread, no damage to any part of the system - it even ran stable for 5 or 10 minutes while the block and whatever coolant was inside it at the time heated up. Once those were hot though it didn't run very long at all (wouldn't finish booting).
I've also played with rad-fan failure. Actually, I recommend more people experiment with this, if you keep an eye on it you're plenty safe. It takes a CPU a long time to warm up the entire mass of coolant circulating in your system, and the rad still passively dissipates some heat. Turn off / unplug your rad-fan and watch your temps. Try it while idle/under load (I can run forever with no fan at idle). See how long it takes for temps to go up 10C or so. Most of you probably last a lot longer than me with no fan as I don't have a res so I don't have much coolant-volume-buffer to heat up before I crash/need to turn the fan back on.
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