Hello all,
I've got a Dell Studio 1535. When I put my laptop down on a flat surface (table, desk, etc.) he CPU fan always runs at high speed and never stops. But when I lift my laptop about an inch off the flat surface the fan goes down to normal speed. I put it back down on the table and the fan goes back up to full speed. So the only think that stops my fan from always running at full speed is putting my eye glass case at the top edge and operates normally. What gives, does this laptop have a light or level sensor that makes the fan speed up or slow down. Looking for some kind of answer to this mystery.

Thanks in advance.it has a heat sensor, basically when the PROCESSOR and motherboard gets too hot the laptop will pick up on this and turn the fan to a higher speed. when its on a flat surface the fan isnt PULLING as much air into the laptop and the components inside heat up. to combat this the computer speeds up the fans to once again increase airflow and REDUCE temparature.

if you want to put it on a flat surface, what i do is put 2 £1 coins under each of the corners to raise it up alittle, this doesnt impare its air flow. if your from american a few Quarters under each corner would help alsoThanks for the reply,
I think I figured out whats going on. I've got a Targus Travler Coolpad (see pic) that I put my laptop on. I think some how one of the little rubber bumpers was sort of blocking the air vent. I picked up my laptop and slide it over about half an inch to the right and it stopped. I'm guessing the VENTS have some kind of sensor or SOMETHING that detects when something is covering those vents.

It's working fine now.

[Saving space, attachment deleted by admin]excelent, well im glad you got it undercontrol, message back if you need any more helpThere are also some laptop holders that tilt the back of the unit up by a few inches and that allows for air flow. And because the keyboard is slightly tilted it makes for easier typing, more like a desktop keyboard.