Laptop CPU keeps turning off.

[Skeith]

Recently the fan on my CPU has been turning off randomly.

I dont know what is causing it. I have no options for the fans shutting off on idle so that shouldent be the issue. It will start back up too, and sometimes I have to reboot to get it back. It has only been doing this the past few days.

Sometimes it will go all day without doing it.

I dont think there is anything wrong with the fan because when it is on it runs perfectly fine, no weird sounds or fluctuations in RPM.

http://img.photobucket.com/albums/v106/InternalVoice/cpu1.jpg
Here it was off

http://img.photobucket.com/albums/v106/InternalVoice/cpu2.jpg
A couple minutes later it was back on.
Shortly after I took this screenshot it turned back off.

I noticed this whent he cpu reaches like 48*C on idle.
This is realy starting to annoy me. I dont want this to happen while Im doing something CPU intensive and have the CPU overheat on me.

Here is my log from speedfan.
Win9x:NO 64Bit:NO GiveIO:YES SpeedFan:YES
I/O properly initialized
Linked ISA BUS at $0290
Linked Intel 82801GB ICH7 SMBUS at $10C0
Scanning ISA BUS at $0290...
none at $3E8 msg : DELL Sensor constructor starting...
none at $3E8 msg : DFC : c=0000 d=0100 s1=0000 s2=0000
none at $3E8 msg : Fan 0 properly set through SMBIOS
none at $3E8 msg : DFC : c=FFFF d=0101 s1=0000 s2=0000
none at $3E8 msg : info1 : CMD=$0023 DATA=$4C00 S1=$0000 S2=$0000
none at $3E8 msg : info1 : CMD=$0020 DATA=$7F80 S1=$0000 S2=$0000
none at $3E8 msg : info1 : CMD=$0024 DATA=$4480 S1=$0000 S2=$0000
none at $3E8 msg : info1 : CMD=$001C DATA=$3080 S1=$0000 S2=$0000
none at $3E8 msg : ERROR info1 : CMD=$FFFF DATA=$0004 S1=$0000 S2=$0000
none at $3E8 msg : info fan0 : CMD=$0788 DATA=$0000 S1=$0000 S2=$0000
none at $3E8 msg : info fan1 : CMD=$039A DATA=$0001 S1=$0000 S2=$0000
none at $3E8 msg : info fan2 : CMD=$039A DATA=$0002 S1=$0000 S2=$0000
Scanning Intel SMBus at $10C0...
SMART Enabled for drive 0
Found FUJITSU MHW2120BH (120.0GB)
Found ACPI temperature (25.0C)
End of detection
Loaded 0 events

Could it be a BIOS issue or something wrong with the bus controlling the PWM?

[SeasonalEclipse]

Sounds like a sensor on the board might be going bad on you.. Is your laptop still under warrenty?

[Skeith]

Yes the laptop is still under warranty. I dont realy want to have to take it in though. Could it be possible that speedfan might be messing it up?

It seems to do this after Ive had the machine running for long periods of time. Im goint to e-mail dell and see what they say. In the meantime any further feedback would be greatly accepted.

[Skeith]

well there is some thermal management. However you cant change it in the bios. So im thinking the fan is being shut off by this. I just may not have noticed it before. apparently I8kfangui allows modifications to be made to the bioses thermal management so im going to look into that and see if this does anything.