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Re: Case fan won't come on. pulled it and tested...
Yes ...the case fan will no doubt be thermally controlled if it's connected to the motherboard .... and obviously something has gone wrong with the sensor. Have a look round and see if there are any other 2/3 fan connectors on the motherboard you could use. Most times there's the "cpu fn" (we don't want to disturb that one!), "sys fn" and one or more "case fn" connectors, but being a bespoke motherboard in that SFF case you may be out of luck. You've already hooked it to 12v to get it working so it wouldn't be difficult for you to wire it permanently to a spare power connector (you will probably have to cut the cables and rejoin them). However bear in mind that the fan will then run continuously.
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Most probably your power supply. An SLI rig will draw a lot of power for the graphics and for a power supply in a system like this to have lasted 5 years is amazing. They don't last forever. You could buy a PSU tester (about 10 GBP) and confirm it. But if you have to buy a new one look for one that is at least 25percent more powerful than your old one and has at least a bronze efficiency rating. (silver would be better) and buy one from a known brand such as Antec, Chillmaster, or OCZ.
When the CPU overheats then it will shut down (i.e. thermaloverload) and won't boot up again until it has cooled down. If this is theproblem is not fixed then the CPU will eventually fail. A faulty fan causes the problem or the fan and heat sink assembly are cloggedwith dust. Check the CPU fan to see if it spins freely, if not replace the fan. If the fan and heat sink is clogged with dust the remove the dust and make surethe vents are clear and dust free. Use a small brush and can of compressed airto do this.
The processor sounds as if it is not being held by the CPU locking device. Get it re-installed and you should be okay. It is just a case of removing the cpu fan and heatsink ( while the power lead is unplugged of course) lift the locking lever (dependinding on the processor type) and reseat the processor, lower the lever and lock in place. try to give the cpu a wiggle, but not too hard, as long as it doesn't move then rebuild the computer and try it out. Good luck, and don't try it as if you are removing a six inch nail with a mallet. It should come to bit easy enough.
Hi, There should be 2 male fan connectors on the motherboard, one is for the CPU fan and the other is for the case or system fan, this will marked on the motherboard and are usually white in colour. The case or system fan are not usually temperature controlled but in some cases you can adjust the speed in the BIOS, the CPU fan however is temperature controlled.
The only way to fix it without basically replacing the whole computer would be to replace the CPU cooler but that might not even be possible. You can try cleaning out the case to get rid of the dust. In any case the CPU has to work harder to decode the video which will cause it to heat up which in turn causes the cooling fan to spin faster.