Glad its all fixed.
My first instinct of it being the pump was correct then, just surprised in could go so quickly (8 weeks I think you said?)
Short straw/unlucky pick I guess and got a dodgy one....but it was also kinda the reason why i chose one of the corsair ones when i picked my cooler. Coolermaster is PCS's own if i am right?
In a way, you are fortunate you heard it, the pumps can go completely and not make any noise, you wouldnt know until you started getting overheating problems, with yours it was obviously still working, but failing fast.
Out of curiosity (never fitted a water cooler myself) how "fragile" did it feel fitting it? My concern has always been i would over-do it and break something.
Yes, your instinct was correct, and I really appreciate you posting. To be quite honest, I was stumped - I knew something wasn’t right but I had no idea what it was. I didn’t even know that, that particular part was the pump. The last time I owned a desktop was c. 16 years ago and my last bit of tinkering was installing a FireWire card so I could plug in my iPod 1. Things have changed a lot since then.
Re: fitting, It didn’t really feel fragile at all. I was worried that the plastic pipes or the connections between said pipes and the pump/radiator might crack but they are pretty sturdy things. The tricky part was mounting the pump on the bracket over the cpu. The first time I fitted it it took me about half an hour although I wasn’t happy with my pasting so removed it, started again and the second time took about 2 minutes. My cable management is a bit more ‘industrial’ than the PCS engineers but it’s in a define 7 so you can’t see it anyway! Definitely an easy fix.