T W A U ... The Chase...from...
Film, Media & TV4 mins ago
No best answer has yet been selected by 19mick73. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.You can download a copy of PC Advisor 2005 which is free but this only gives hard disk temperatures.This would give some indication of the internal case temperature. It's a useful utility anyway.
What motherboard do you have ? The manufacturer may have a utility that shows CPU temperature - Intel boards have this. Otherwise booting and going into the BIOS should show you CPU temperature.
If you have a rattling noise from the back then you can be 95% sure that the bearing on the power supply fan is worn and has no more lubrication left and it will rattle, usually worse when you first switch on and getting a bit less after a few minutes. It could also be the proccessor or video card fan inside but you would not usually hear it outside the casing unless it was REALLY bad.
If you live where I am it might also be a dead lizard inside the fan casing, but in the UK I don't think that's likely to be your problem.
Don't know of a website for comparing temperatures/fan speeds. I don't think Intel ever published temperatures for the PIV.
As a comparison, my PIV runs at around 36 degrees C, the Motherboard and internal temperatures around 32 and hard drives around 30. Mines probably over ventilated in a fairly large case with additional fans.
Certainly with the PIV it has built-in protection to slow down and even shut down as temperture increases.