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Generally, fans are controlled by heat readings...something to check is the operating temperature that is shown in your BIOS when you boot up...(access your BIOS by tapping on the delete key, or F2 key while booting)..if it goes over 70C real quick then there is a CPU heat dissipation problem, which would cause the fan to run like this i think that it is more of an issue that your CPU died...has your machine taken any kind of hit or fall that might have loosened things?...or perhaps the heat sink compound between the heatsink and CPU failed..... but it also could be a dead MB
first, did this problem suddenly appear?...or was it slowly getting worse?
It sounds like an interrupt problem with the video hardware. If this problem suddenly appeared, then boot Safe Mode and then run system restore to date just before problem occurred.
If this came gradually, then solution is same as above except finding date will be more difficult and trial and error routine will be necessary.