Hi Ok, so yesterday on my old system I removed the PSU from the case/system (it's an Thermaltake 480w Butterfly btw). Opened it up just to find dust.. And I don't mean a little dust, I'm talking about like a handfull of dust! However, it's clean from dust now. Was a bit tricky to remove dust from the pcb without removing it from it's own case (due to high electricity, I did not remove it). I also removed 1 fan grill, the one that is "under" the PSU that should suck hot air in - and blow it out thru the rear. The PSU itself is connected to the mobo and can tell me things like fan speed and temperature. The main reason why I opened it up is because it went as high as 60+ Celcius. And the past week(s) it has even managed to heat up my room! Would I would like to know is, does dust make the PSU perform less "good"? I mean, that heat just can't be good for it. I don't have the digital camera at home, I wanted to show exactly how much dust and where. It's also equipped with heatsinks, and the dust on them was terrible.. <Reminder!> If you do not know what you are doing, or are aware of the high electricity contained within a psu do not open it! It's lethal, so let a trained/certified professional do it for you.