Cooling fan cycles on and off constantly

tbfoto · 07-04-2007, 11:42 PM

My HP Pavilion a1340n cooling fan has started cycling on and off all the time. It will come on for about 10-15 seconds then off for about 45 seconds...then back on again....then off again. It sits on my desktop and has plenty of space around it for air flow. Could there be a "sensor" going bad or does it really need to be doing this? It even does it throughout the night when noone is using it.

Thanks

**oscaryu1** · 07-04-2007, 11:53 PM

No noises from the fan? When did this start? I would try to get my hands on another fan (any 3 pin fan) and plug it in into its slot. If it spins normally then your fans dyin.

tbfoto · 07-04-2007, 11:57 PM

Actually, now I think I can still hear the fan when I thought it was off. It is very quite but I think it is running. So could this louder noise be another fan kicking on and off? It is much louder.

**oscaryu1** · 07-05-2007, 02:02 AM

Yes, maybe PSU fan or sometihng.

AdmnPower · 07-05-2007, 02:28 AM

what kind of processor is it, some processors (like my pentium d) have fans that are automatically variable speed and therefor speed up and slow down based on need. Some don't support this, if your processor doesn't support this and the fan is speeding up and slowing down then it needs to be replaced.

tbfoto · 07-05-2007, 03:00 AM

It's a pentium 4. It did not do this when it was new. However it started about 3-4 months ago but now it does it more often. I don't think it is a variable speed fan. The sound that I am hearing is defintly a on and then off fan. I guess I need to take the shell off and watch and just see for myself what is going on.

**oscaryu1** · 07-05-2007, 03:07 AM

I think your refering to the SMART fan control ?

tbfoto · 07-05-2007, 03:27 AM

Quote:

Originally Posted by oscaryu1

I think your refering to the SMART fan control ?

I've never heard of that. Can you explain? I'll have to see if I can find any reference to that in my manual

**oscaryu1** · 07-05-2007, 03:51 AM

Its in BIOS... the HEALTH or temperature monitor place. Its says SMART FAN CONTROL ENABLE/DISABLE

AdmnPower · 07-05-2007, 04:02 PM

yeah, thats what i meant, sorry about that

07-04-2007, 11:42 PM	#1 (permalink)
tbfoto Bronze Member Join Date: Jan 2006 Posts: 47	Cooling fan cycles on and off constantly My HP Pavilion a1340n cooling fan has started cycling on and off all the time. It will come on for about 10-15 seconds then off for about 45 seconds...then back on again....then off again. It sits on my desktop and has plenty of space around it for air flow. Could there be a "sensor" going bad or does it really need to be doing this? It even does it throughout the night when noone is using it. Thanks

07-04-2007, 11:53 PM	#2 (permalink)
oscaryu1 Moderator Join Date: Apr 2007 Location: Houston, Texas Age: 13 Posts: 10,155	No noises from the fan? When did this start? I would try to get my hands on another fan (any 3 pin fan) and plug it in into its slot. If it spins normally then your fans dyin. __________________ Core 2 Duo E2140 1.6GHz @ 3.04GHz GA-P31-DS3L pqi Turbo CL4 DDR2-800 2GB Sapphire HD3850 256MB Sony Writemaster DVD Burner EIDE Seagate Barracuda 80GB 7200.9 8MB SATII

07-05-2007, 02:02 AM	#4 (permalink)
oscaryu1 Moderator Join Date: Apr 2007 Location: Houston, Texas Age: 13 Posts: 10,155	Yes, maybe PSU fan or sometihng. __________________ Core 2 Duo E2140 1.6GHz @ 3.04GHz GA-P31-DS3L pqi Turbo CL4 DDR2-800 2GB Sapphire HD3850 256MB Sony Writemaster DVD Burner EIDE Seagate Barracuda 80GB 7200.9 8MB SATII

07-05-2007, 02:28 AM	#5 (permalink)
AdmnPower VIP Member Join Date: Jan 2006 Location: Indiana, USA Posts: 1,177	what kind of processor is it, some processors (like my pentium d) have fans that are automatically variable speed and therefor speed up and slow down based on need. Some don't support this, if your processor doesn't support this and the fan is speeding up and slowing down then it needs to be replaced. __________________ Intel Core 2 Quad 2.4 ghz 4 gig DDR 2 800 Sapphire Radeon 3870 X2 250 gig Seagate Barracuda Windows Vista

07-05-2007, 03:07 AM	#7 (permalink)
oscaryu1 Moderator Join Date: Apr 2007 Location: Houston, Texas Age: 13 Posts: 10,155	I think your refering to the SMART fan control ? __________________ Core 2 Duo E2140 1.6GHz @ 3.04GHz GA-P31-DS3L pqi Turbo CL4 DDR2-800 2GB Sapphire HD3850 256MB Sony Writemaster DVD Burner EIDE Seagate Barracuda 80GB 7200.9 8MB SATII

07-04-2007, 11:57 PM	#3 (permalink)
tbfoto Bronze Member Join Date: Jan 2006 Posts: 47	Actually, now I think I can still hear the fan when I thought it was off. It is very quite but I think it is running. So could this louder noise be another fan kicking on and off? It is much louder.

07-05-2007, 03:00 AM	#6 (permalink)
tbfoto Bronze Member Join Date: Jan 2006 Posts: 47	It's a pentium 4. It did not do this when it was new. However it started about 3-4 months ago but now it does it more often. I don't think it is a variable speed fan. The sound that I am hearing is defintly a on and then off fan. I guess I need to take the shell off and watch and just see for myself what is going on.

07-05-2007, 03:51 AM	#9 (permalink)
oscaryu1 Moderator Join Date: Apr 2007 Location: Houston, Texas Age: 13 Posts: 10,155	Its in BIOS... the HEALTH or temperature monitor place. Its says SMART FAN CONTROL ENABLE/DISABLE __________________ Core 2 Duo E2140 1.6GHz @ 3.04GHz GA-P31-DS3L pqi Turbo CL4 DDR2-800 2GB Sapphire HD3850 256MB Sony Writemaster DVD Burner EIDE Seagate Barracuda 80GB 7200.9 8MB SATII

07-05-2007, 04:02 PM	#10 (permalink)
AdmnPower VIP Member Join Date: Jan 2006 Location: Indiana, USA Posts: 1,177	yeah, thats what i meant, sorry about that __________________ Intel Core 2 Quad 2.4 ghz 4 gig DDR 2 800 Sapphire Radeon 3870 X2 250 gig Seagate Barracuda Windows Vista

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode