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Re: CPU fan runs at high speed and won't boot
Take your memory out and try turning it on. You should get a beep code. Put one memory stick back in and turn it on. If the fan still runs high try a different memory slot and if that does not work try a different memory stick.
My experience shows that their could be a memory problem.
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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 can of compressed air to do this.
Usually the fan regulates its own speed (or rather the BIOS does) in relation to the current heat, you may have heat/environmental issues, or power issues. However I would first check to see that the fan speed isn't statically(permanently) set to a high speed. You can check this in the BIOS, as the machine starts up it will flash a small message ( For Setup or For Setup, something like that), hit the stated button to enter your BIOS, under 'Thermal' or 'Hardware' you should be able to find fan speed.
The speed is determined by a cause ..and to make it worked like It used to , you have to eliminate the cause...It probably has a dirty heat dispenser ..and the cleaning will make it run smooth again ...but also check the bios settings for the fan ..For dell there are available more than one modes..and you can go to bios and see which way is set ..Select the quiet mode and save changes on exit
Sounds like a bad motherboard, I try resetting the bios , removing everything but the video , could be a bad power supply too (if you have one jump the wires in there as a test). you can buy those dell MBs cheap on fleabay.
i had same problem today and i tested my machine and solved the problem at last.
the problem is the thermal value that your mainboard sets for your cpu.
please replace the mb.
ps: before this process,i tried almost everything . cpu fan , memory , cpu , cables ,case ... everything. but the problem is on your mb.