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Fan Slows down Why?

F

freeway

Senior member
I have a 2 year old PII300 with a generic LX mobo and generic 235 watt powersupply. Whenever the hard drive cranks, the cpu cooler fan slows down, as soon as the HD stops cranking, the fan speeds up again. It is very noticiable. This just started a month or two ago. I know the fan is Ok, because I tested it in my main system. I am thinking it must be the Power supply or the Mobo. It is the only fan that slows down and it is also the only one plugged into the mobo. Anyone else have anything like this happen? What do you think could be causing it? Thanks for any input.
 
More than likely your power supply cannot keep up with all of your compontents at once. Consider a 300w power supply, or consider taking some expansion cards out of your computer. I could be wrong, but that is probably the culprit.
 
The stuff in the system should not take much juice.
pII 300
6 gig seagate hd 5400rpm
24x cdrom
Elsa tnt2
siig pci sound card
realtek pci nic
USR ISA modem
floppy
one intake fan on case
cpu cooler fan
235 power supply -fan set to exhaust
I don't even overclock this system. The intake fan (not connected to mobo) does not slow down, and I have not been getting errors in windows. The only problem that I can see is the fan slowing down - also causes the system to run hot. It gets so hot that the PII burns my fingers.
 
Ok, I took out the soundcard, NIC, and Modem. I unplugged the cdrom. No change. I spent a few minutes looking at he fan, and I can hear more than see it slowing down. Every time the HD grinds, the fan changes pitch and sounds like it is straining.
 
Is there another fan header on the mobo you can plug the fan into? I had a similar situation that ended up being the fan header itself.

I had a dual fan CPU cooler that would slow way down on me. If I plugged it into a different header, I was OK. I could plug a case fan into the "bad" header and it would run fine.
 
Thanks for the ideas. I'll try to find another header on the mobo to plug it into. I will also try another fan (lower wattage) and see if that makes a difference.
 
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