Any ideas on this?
Its a socket 754 machine, something like a 2Ghz Athlon, 1G memory. Debian Squeeze. It has always worked just fine, and in almost all ways except this still does. What has just now started happening however is that the owner has started to read the papers online. Sometimes, it doesn't seem to matter which paper or which browser, there will be a page with 'the wrong kind' of graphics. Its not clear exactly what the wrong kind is, some are fine, others seem not to be. Gradually, the fan will start to speed up.
If you now start up gkrell, you can see that cpu temperature starts to rise quite rapidly to the high 50s, and the fan gets very loud indeed. I don't know how far it would go, because one of us closes the browser fairly soon when this happens, and eventually the temperature falls to below 50.
It does not do it when displaying pictures. For instance, one can load in a file of a few hundred, and it will display the thumbnails fine, and then one can page through them repeatedly, they come up an display quite fast, and there's no problem.
It does do it when rendering some pdfs. Particularly, it did it with a graphics intensive pdf of some sort.
I thought about getting a better cpu cooler, this is the stock one, but there is very little space in these smallish cases. And I can't see why this should be happening. I have other barebones of this sort, Asus, and it never does. Another machine is an old 754, and it does not happen on it.
I'm not completely sure if this is new, because I'm not sure whether this sort of graphic content was displayed previously.
Meanwhile, there's a Novatech small form factor i3 machine at 400 which is looking more and more attractive.... Bought one for someone else, they are fairly compact, quite quiet, and run very cool. 754 is pretty old hat nowadays, so maybe its time.
Peter