This is usually due to a ram fault or some other physical error. check and make sure the ram hasn't popped out of place by unscrewing the panel on the bottom of the laptop
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The fans heat speed is low speed and the cool speed is high speed. High speed is controlled by the fan relay normally open switch, the low speed is controlled by the temperature delay or time delay.
see diagram
I would need more info to give any advice. I assume you mean the blower for the ac and heater. How is it not working but works on high ? And what power are you turning off that makes it blow harder ?
see this causes: Lid switch test for open or defective use the DVOM OR VOM Motor coupler COUPLER wears see the diagram Belts broken or worn replace Clutch clutch worn replace Drive motor bearing and winding burn in one directionor defective by overheating Drive pulleys drive pulley frozen or worn replace Transmission broken gear or worn
It appears you have a faulty CPU fan and it is causing the CPU to overheat and shut down. I suggest you replace the CPU fan. remove any dust from the heatsink and put new heatsink compound on the CPU/heatsink.
There are 2 basic fans in Dell tower one for the power supply and the other for the Processor. If your computer is not booting then the Processor fan is most likely to be the culprit. What could be happening is that the Processor fan is no longer turning fast enough to cool the processor, so normal the processor when it over heats there is either protection to switch off the computer automatically or the computer won't boot. The best thing is to change the fan and make sure it is working properly but checking on the cables that they won't entangle on top of the fan to impede it's movement. You can easily damage your processor if the fan is not working properly.
The computer fan may be clogged with dust or may have failed. The computer monitors the fan and if it is not working it will not let the computer start. It is a way for the pc to keep itself from overheating. Unplug the computer and open the cover and carefully try to vacuum or blow out all the dust. Then with the cover off try starting the computer and watch the fans and see which one is not turning, it may start if there was a lot off dust. If not the fan may need to be replaced. Thanks for using FixYa.
1. Check the video cable (the one going from the monitor to the video card)
2. Check if the video card is properly connected to the motherboard (must be tightly plugged into the port)3.This could also mean that the drivers for the video card are not correctly installed
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