Can Bad Case Fan Kill PSU?
Posted 27 December 2014 - 10:20 AM
Posted 27 December 2014 - 12:03 PM
Hi DarkPassenger, and welcome to Geeks to Go!
The case fans really aren't meant to keep the PSU cool. The PSU is enclosed in its own metal housing will have its own internal fan. It should be visible if you look through the back of the PSU. The case fan is really for internal components such as (but not limited to) RAM, hard disks, graphics cards (at least the ones without their own fans), etc. If the lights are on but the fans are not spinning then I suspect that the BIOS has not determined it to be necessary - some fans only spin when the temperature reaches a threshold. Did the fan previously spin at boot before you swapped the PSU? Does the system boot?
In short, I do not suspect the PSU to have been damaged by the case fan ceasing to work, but I need more information to accurately answer your question regarding whether or not the case fan is supposed to spin at boot.
Posted 27 December 2014 - 12:52 PM
Posted 27 December 2014 - 01:10 PM
You're very welcome and we're glad to help! You're doing fine.
I would recommend re-installing the case fan. Go ahead and reconnect it just as you found it. Different computer manufacturers and models have different configurations. Some will always run the fan so long as it has power, and others will only activate the fan when a temperature threshold is met. The fact that it connects to the PSU directly indicates that it should always be running. A fan connected directly to the motherboard would indicate that it is regulated by the board.
Can you please clarify whether the lights you mentioned are on the fan or somewhere else? It would be unusual for a fan to have lights on it, but some computers (especially those made for gaming) will use them for aesthetics. Are there other case fans? Do they work?
When you mention the fan blades not spinning freely, does it feel like there is a spring or something that returns the blades to a particular position? It's difficult to explain, but most fans I have encountered will spin if you lightly flick them with your finger, but after a couple of seconds, you see them stop at the same position you started at. A "free moving" fan would spin for much longer I suspect. Does that sound like what you have noticed?
I suggest putting the case fan back in and connecting it the same way you found it. Power-on the PC and see what happens. The BIOS may display an error if it cannot communicate with the fan, or it may be simply ignored. Leave the system on for a short time and even try using it. See if the fan spins up after a bit. The worst case scenario is that Windows will shut down the system and display a "blue screen" (affectionately known the Blue Screen of Death (BSOD). If that happens, don't panic - we're half expecting it. One time won't hurt the system but prolonged heat exposure could damage some components. When you check to see if the fan is running, place your hand on the outside of the case and see if it is hot to the touch. A little warmth is fine, but it shouldn't be hot necessarily. If it feels hot or starts to smell strange, then power the system down immediately. That's an extreme scenario but knowledge is power, right?
Let us know how it turns out.
Posted 27 December 2014 - 01:18 PM
Posted 27 December 2014 - 02:30 PM
Ok, very good. I would not worry about the fan not moving freely then - It sounds normal to me. The lights on the fan are a good indication that it is receiving power. We'll look forward to hearing from you.
Posted 28 December 2014 - 08:04 AM
Posted 28 December 2014 - 08:16 AM
Good morning! Thanks for your feedback and for posting a detailed summary of your experience! You've done pretty well but don't hesitate to start a new topic in the system building forum if and when the time comes to build a new system. We're happy to help.
Best of luck and we'll see you around!
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