Think there were a couple of simple hose failures, think one a radiator crack, all have been on the user - te very few I have built, I tell them flat out, if they open the case, don't call me if they have a problem with it. If they want a DRAM or video card, bring me the rig, I'll do it for free, I simply don't want them touching water cooling if I put it together, if it goes, could waste mobo, CPU, who knows