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post #991 of 1086
Quote:
Originally Posted by kevindd992002 View Post

Well, I can't say for sure but it's worth a try. Is your PSU still under warranty? It's just that your PSU is connected to the mobo, so it's natural that if your fan has problems when it is directly connected to the PSU then it would also have problems when connected directly to the mobo.

Do you have a voltmeter at hand? You could try measuring the 12V rail and see if the voltage is not fluctuating. Also, you can try removing the PSU from the computer, powering it with the metal short test while the fan is directly connected to one molex connector.

It is no longer in warranty. Does it make sense that the PSU would continue to power everything else except for one fan? I guess I don't understand how a PSU picks and chooses what to power. I would have assumed it either powers everything or nothing. I did double-check and the molex connection was directly from the PSU. Unfortunately I do not have a voltmeter (i might be able to borrow one from a friend though). Also, I'm not sure what you mean by "powering it with the metal short test"?
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post #992 of 1086
Quote:
Originally Posted by gorgando View Post

It is no longer in warranty. Does it make sense that the PSU would continue to power everything else except for one fan? I guess I don't understand how a PSU picks and chooses what to power. I would have assumed it either powers everything or nothing. I did double-check and the molex connection was directly from the PSU. Unfortunately I do not have a voltmeter (i might be able to borrow one from a friend though). Also, I'm not sure what you mean by "powering it with the metal short test"?

No, the PSU cannot distinguish its load from another. It continually supplies +12V and +5V in a molex connection and your fans are drawing a significantly low amperage compared to the PSU's capability so you shouldn't be having any problems.

You can remove the PSU from your computer and power it by shorting (connecting with a metal wire) two specific fins. It's like powering the PSU from the outside of the case without using the power button. Google about this and you'll see a lot of hits.

Hope this helps.
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post #993 of 1086
If you computer is running with no problems and it's only this fan that is giving you problems it more than likely the fan or the molex connector.
post #994 of 1086
Quote:
Originally Posted by kevindd992002 View Post

No, the PSU cannot distinguish its load from another. It continually supplies +12V and +5V in a molex connection and your fans are drawing a significantly low amperage compared to the PSU's capability so you shouldn't be having any problems.

You can remove the PSU from your computer and power it by shorting (connecting with a metal wire) two specific fins. It's like powering the PSU from the outside of the case without using the power button. Google about this and you'll see a lot of hits.

Hope this helps.

Quote:
Originally Posted by doyll View Post

If you computer is running with no problems and it's only this fan that is giving you problems it more than likely the fan or the molex connector.

I have now replaced both the fan and the PSU and the same problem occurs. With the new fan plugged directly into the mobo, which is powered by the new psu, the fan spins for a couple of minutes and then stops, and the CPU overheats. With the new fan connected directly to the mobo with the molex connector, the fan just doesn't spin at all. I'm pulling my hair out!

Does this mean the motherboard has issues? Or that I'm going crazy and missing something obvious?
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post #995 of 1086
Quote:
Originally Posted by gorgando View Post


I have now replaced both the fan and the PSU and the same problem occurs. With the new fan plugged directly into the mobo, which is powered by the new psu, the fan spins for a couple of minutes and then stops, and the CPU overheats. With the new fan connected directly to the mobo with the molex connector, the fan just doesn't spin at all. I'm pulling my hair out!

Does this mean the motherboard has issues? Or that I'm going crazy and missing something obvious?

Did you even try what I just suggested earlier using the PSU short test and directly connecting the fan to it? If that works, then your board is most probably the problem. Something in the board is short circuiting the PSU after a few minutes and renders the voltage lines null.
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post #996 of 1086
Quote:
Originally Posted by kevindd992002 View Post

Did you even try what I just suggested earlier using the PSU short test and directly connecting the fan to it? If that works, then your board is most probably the problem. Something in the board is short circuiting the PSU after a few minutes and renders the voltage lines null.

That sounded complicated and difficult. I thought replacing the PSU would would easier and accomplish the same thing. But I think I get what you're saying. I'll see if I can figure it out or find a vid on youtube to try this. It is pretty consistent that the fan spins until Windows boots now (when connected to mobo). Once Windows loads, the fan stops spinning. I'll also try disconnecting some other components and see what patterns may come up... thanks again!
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post #997 of 1086
Quote:
Originally Posted by kevindd992002 View Post

Did you even try what I just suggested earlier using the PSU short test and directly connecting the fan to it? If that works, then your board is most probably the problem. Something in the board is short circuiting the PSU after a few minutes and renders the voltage lines null.

OK - I just tried it. I connected the fan directly to the PSU, the PSU plugged into the wall outlet but not into the mobo, and I started up the PSU with a paperclip. The PSU fans spun as expected but the CPU fan that was connected to the PSU via molex connector did not. It kind of "lurched" as if it was going to spin but did not do more than a full revolution before stopping. Weird behavior. Does this mean I need to try a third fan? I don't understand how the mobo could be the issue if the fan won't even spin while connected directly to the PSU. I guess my molex connector that I bought could be bad? Thanks again for any and all help!
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post #998 of 1086
Quote:
Originally Posted by gorgando View Post

OK - I just tried it. I connected the fan directly to the PSU, the PSU plugged into the wall outlet but not into the mobo, and I started up the PSU with a paperclip. The PSU fans spun as expected but the CPU fan that was connected to the PSU via molex connector did not. It kind of "lurched" as if it was going to spin but did not do more than a full revolution before stopping. Weird behavior. Does this mean I need to try a third fan? I don't understand how the mobo could be the issue if the fan won't even spin while connected directly to the PSU. I guess my molex connector that I bought could be bad? Thanks again for any and all help!

That's weird indeed. Did you try a different fan model? Or did you try to measure the voltage of the molex connector? 12V and 5V?

Regarding what I said about the mobo, it can short out the PSU when you connect the 24-pin to it but that is very rare.
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post #999 of 1086
Quote:
Originally Posted by kevindd992002 View Post

That's weird indeed. Did you try a different fan model? Or did you try to measure the voltage of the molex connector? 12V and 5V?

Regarding what I said about the mobo, it can short out the PSU when you connect the 24-pin to it but that is very rare.

No, it's the same fan model that I had previously. But the fan worked for 2 years before this issue began... I dont have a way to measure the voltage but my PSU is supposed to output 12V.

At this point does it come down to either the PSU is a dud or the fan is a dud? Even though I've just replaced them both? Or is there any other logical conclusion or something else I can try?
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post #1000 of 1086
Quote:
Originally Posted by gorgando View Post

No, it's the same fan model that I had previously. But the fan worked for 2 years before this issue began... I dont have a way to measure the voltage but my PSU is supposed to output 12V.

At this point does it come down to either the PSU is a dud or the fan is a dud? Even though I've just replaced them both? Or is there any other logical conclusion or something else I can try?

It is very unlikely that the PSU or the fan is a dud since you've already replaced them both. Are you sure that the power that comes in to the PSU is at rated spec?

When you did the paperclip test, did you totally isolate the PSU cables from the motherboard?
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