Bizarre intermittent fan

[Wej]

This is an old machine so I can understand if the fan is going wrong, but recently I took off the fan/hs (all in one affair) and cleaned it out. I removed loads of dust and was very pleased with myself.

Put everything back together, turn on PC and fan spins up, and down again. 3 seconds, spin up, spin down.... 3 seconds... spin up, spin down. However, the CPU is steadily getting hotter so it's not that it's too cool to bother (and it never spun up/down based on temperature before)

Now the fan has a resistor attached which let me vary it's speed - this no longer does anything - it carries on with this bizarre spin up/down affair.

Is the fan broken? If not, have I forgotten to attach something?

If I'm getting a replacement, anyone recommend one - it's an old Athlon motherboard running a 2600, and socket A coolers seem to be thin on the ground (it's the old 3 'hooks' fitting method)....

Help gratefully received.

 

[jak731]

Sounds like it might be a loose connection, i would try disconnecting and reconnecting the fan. If that makes no difference the fan might have had it.

 

[Wej]

No, tried unplugging and plugging in a number of times, as well as changing the molex connector.

WIll order a new one

 

[thegoonden]

1.mental sensor
2.bad connection
3. resonance, stick yer paw on the cooler, is it shaking like mad? If you grip it tight does the fan pick up speed properly and stay there?

I've had a couple of CPU fans which burned their bearings out. There were many weird and wonderful phases of this syndrome. Cycling with irritating regularity between two fan speeds was one......imeadiately followed, a week or so later, with having to hand crank the fan on boot LOL

4. Could also be speedfan/hardware equivalent thereof, driving itself loopy, best kill it off.

 

[bledd]

i had a testing pc (no case) that had a gammy fan, i had to help it on the first spin when booting

just buy a new fan, cheap as chips