Hi there, I'm an engineer working for a big reseller of Fuji-Siemens PC's. Won't mention any names. But hopefully I can provide some help to all of you having heat-related problems with your PC, as I've dealt with many recently. Some of them have even been serviced by Fuji under 12 month warranty but they dont seem to have been sorted properley.
To begin, as most of you know, the Heatsink and fan combo fuji fitted as standard is very big and quiet. quite a nice bit of kit and great when it works... However it has one small but rather critical flaw. the collar/pipe containing the fan, which fits on top of the heatsink, is butted up to the heatsink. On every other heatsink/fan you look at you will see there is a few mm of airspace. This allows the dust which builds up to simply blow off to the side. Or the Heatsinks fins are further apart and the dust does not collect in the first place. This flaw means your heatsink is working like a bag on a vacuum cleaner and getting dirtier and dirtier. Eventually the fan does not fail, but simply enough air does not get through to cool the CPU sufficiently.
In a (not very) wise move by Fuji - the CPU overheating warnings that are availiable in the BIOS are turned off by default. This means that as the dust builds up your machine gets closer and closer to the edge of destruction. When a P4 processor turns itself off, things are already REALLY bad. P4 processors can keep going up to around 115 degrees centigrade! Above 80 they start to "throttle" themselves to keep the heat down but eventually the lack of cooling defeats even this. I recommend turning this feature on ASAP - Set it to 90. If it hits this mark and the warning kicks in. Turn it off. Now.
The obvious move is to clean the Heatsink and put it back together and keep an eye on it. Or just swap it as they only cost a fiver. Thing is by this time most people have already kept trying to use the machine and thereby damaging it a little more each time. Try this step - if your machine is back to normal - your lucky!...
SO - You've cleaned/changed the heatsink, why isnt it working all as it was? Well to put it simply the constant overheating has killed the motherboard. I have put a top-notch fan and heatsink on one of these machines and although the fan can keep the temps down the chip is being thrashed constantly. I think it may be the voltage controller but not 100% sure. Even a new CPU doesnt keep the temps down.
The good news - Your CPU is probably fine. Which is very good as 3.2/3.4 P4 CPU's are virtually impossible to get.
The bad news - Your Motherboard is knackered. They are availiable from servicesource at around £60 - Or get a generic for around £30-40
Hope this helps and stops you from banging your head against the wall! - Any Q's feel free to ask!
PS - IF YOUR SCALEO IS NOT OVERHEATING STILL ENABLE THE OVER-TEMP WARNING IN THE BIOS, AS ITS COMMON SENSE! (take note fuji)[/b]