Odd Fan Surging on Father's PC

Since this is a case fan we're talking about, it seems to be pretty simple to find out for sure, which one it is: computer off, pull out fan connector, computer on, noise gone?  

I guess the PSU cable provides higher voltage than the motherboard connector, that's why it rotated faster and gave the high pitch.

It seems strange that this fan needed 4-5 replacement. Maybe it's the quality of the fans?

1.) Duh! That makes sense! I guess I should try that out.
2.) I'm not sure, but like I said, the same fan I put on my own computer and no longer made that noise. It seemed to be something with his computer I guess.
3.) That is always a possibility I guess, but I was wondering if maybe it had something to do with the motherboard shorting them out.

ave a feeling its the vent fan in the back of the case.

What is odd is that I have replaced the fan in this exact spot about 4-5 times since we have had it. Again, I'm not sure it is this fan exactly, but I'm pretty sure. The surging reminds me of when a car is having problems idling when sitting still (hopefully someone unders

Oh, I see, I didn't catch that.



I'm afraid I'll have to leave it to the electrical engineers, who are hopefully around.

By the way, is this the only free fan connector the motherboard has to offer? What type of motherboard it is? Let's consult with the manual.

Another thing, since we're here... as far as I know, the case fans are not so critical in the maintaining of optimal temperature.
If the noise is that bad, I would check if I can see any difference in processor temperature with and without it. I mean, if the other case fan is in good health and silent, it might be well enough even if it's alone.

Your motherboard will have a controller for this fan, that regulates the RPM as needed to keep the board cool. That could be going out.

The easy solution would be to not use the motherboard to power the fan. Run it off the PSU directly.

Of course, if you have a cheap PSU that's going to cause all sorts of problems. See the PSU guide linked in my sig.

Cheap fans can die fast, especially if they are allowed to pick up a lot of dust. They just aren't designed for the extra weight. I have 11 cheap fans in my water cooled setup. They are all low RPM Yate Loons, and they are dead silent... but they go out real fast, probably an average lifespan of 18 months. (Well they still work, they just get noisy)

Steps I would take, if I were working on the comp:

1. Go into the BIOS and see if there is a fan profile to be changed. See if that resolves it.

2. Evaluate the PSU and replace that as needed.

3. Test with known good fans in that position. Just plug em in and see if the surge.

4. Replace the board or just bypass the fan header by connecting to the PSU.

As far as I know, this is the only fan connector left on the motherboard. I'll have to run speccy to see what motherboard it has, all I know is that it's an Intel with a P4 processor.

The PSU is a InWin 430Watt, which I know nothing about. It is the original PSU.

I'll go ahead and change the fan with one of the millions I have laying around my room, hopefully one of them will fit and work, I'll see if that stops the surging.

Yep cheap PSU from back in the day. It probably needs to be replaced. If it's been running a lot over the years especially.

I think it's either a temp sensor on the board or CPU that is going, or the fan controller on the board is going out.

Might as well include that he also has issues with it being extremely slow..
I've done multiple programs (boostspeed, ccleaner, etc) and it works for about a day or so and goes back to being slow as can be...

I've run combofix as well and seems that it doesn't have any viruses as of then.

Alright, just stuck one of my known working fans into the same spot as the other... still surges. You can hear and feel the fan surging. Only that fan though... (the one that goes in that plugin)

What would that narrow it down to?

You say it's very slow. Is the CPU overheating and throttling back due to heat? that might explain the fan.

The computer itself is slow, software wise.
I'm not sure if it is overheating or not...

Sorry it took so long for the response.

I decided to take it to a local computer shop to have them diagnose the computer, because the computer is 7 years old, my father (because it is his PC) doesn't want to put money into it. Hopefully its nothing serious, and if it is it will probably be ignored until it blows up and he needs another computer.

Best answer selected by xmsteel.

This topic has been closed by Proximon