replace just power supply fan

June 14, 2009 at 11:10:17
Specs: Windows XP prof
We have an Antec 1000 watt power supply and the fan that is attached to it runs slow, or not at all. This causes things to overheat, and the computer randomly shuts down after a loud beep and black screen. We've checked for dust and cleaned things, but keep coming back to the fact that the fan runs slow or not at all. Sometimes we can spin it manually and it will pick up and start spinning faster on its own, and sometimes not. We would prefer not to spend $200 on a new powersupply when it seems the issue is just the fan. Anyone that can help would be appreciated, please keep in mind we are not very computer saavy! Thanks !

See More: replace just power supply fan

Report •

June 14, 2009 at 12:28:00
The fan is supposed to run slow or not at's called "Antec Low Noise Technology". It's a feature built into many Antec PSUs. Here's the description:

"This technology is a new approach that achieves optimum balance between noise reduction and necessary cooling with an advanced temperature response system that outperforms previous solutions. The system constantly monitors the temperature inside the power supply, and then runs the power supply fans at the lowest speed appropriate to load and conditions. Thus it is able to perform much more quietly than standard ATX power supplies or even those with traditional thermally-controlled variable-speed fans."

All it does is monitor the PSU temp. It has nothing to do with the system. While a PSU's fan does assist with case cooling, that's not it's purpose. If your system is running hot, reconfigure your case cooling configuration, not the PSU.

How many case fans do you have & how are they arranged? What's the system & CPU temp - at idle & under load? If your CPU is running hot it's likely that the HSF wasn't installed correctly.

Report •

June 14, 2009 at 13:03:39
please bear with me, I'm not technically savvy. There are three fans. The one attached to the Power Supply, Another on the back of the unit under the power supply and one on the side blowing on the motherboard. If the fan attached to the power supply, and the power supply is so hot that I can feel it, wouldn't the fan be running full speed? It DOES run full speed with a little push from my seems to "catch" and then run for a bit.

Im not sure how to tell what the temperature is, however the Power Supply is hot to the touch after running for a bit and the computer just shuts down ...most the time there is a long beep that accompanies the shutdown but not always.

Also, it's worth mentioning that sometimes it seems as if motion contributes to this. If my kids jump or the desk is jostled roughly, it's likely to shut off with the beep also.

I wouldn't want to spend $200 on a new power supply if it's just the fan that's broken...but please give your opinions. Thanks so much for your help.

Report •

June 14, 2009 at 13:16:04
The PSU you have may still be under warranty. Check with Antec. While the fan is designed to run as needed yours may be partially bound up for whatever reason. Below is an excerpt from the product brochure and a link to it.

AQ5 – Antec Quality five-year parts and labor warranty

Report •

Related Solutions

Ask Question