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Optiplex 745 Mini Tower - Processor fan speeds up for no reason
Yesterday one of our Optiplex 745's decided to start acting up. The processor fan on towards the front of the machine that circulates air throughout the tower, slowly revs up until it's going full steam. Much like the brief second whenever you plug the power into the PSU. It can take anywhere from 10 to 20 minutes for it to happen. However, a simple reboot remedies the issue for a bit. I searched through the forums and found some people complained of an ambient sensor, however I am unable to find such sensor on ours. Currently running BIOS 2.4.1 This is a 2.8GHz Pentium D with 512MB of RAM. Any help is appreciated. Thanks.
Elsbeth.
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614 Posts
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Posted September 20th, 2007 13:00
The sensor is integrated into the front IO panel. If it is disconnected, the system will stop booting and flash an error at start up. You may try replacing the front IO panel with a known good one, to see if the sensor itself is defective.