Posted 19 November 2011 - 12:56 AM
My CPU fan and my chassis fan are each connected separately to the motherboard.
The CPU fan has a 3-pin connector that plugs directly into the motherboard.
The chassis fan has a 4-pin molex connector plugged into the motherboard by way of a 3 pin adapter wire.
When I enter the BIOS or run Asus PC Probe II the speed and temperature numbers for the CPU are both displayed. But there is nothing displayed for the chassis except the legend "NA" where temperature and speed numbers should be. The chassis fan is running at the highest setting, but there is no measurement of temperature nor of fan speed. This generates no error message, nor does it prevent my computer from operating.
This isn't a problem as such, but it's something that genuinely puzzles me. It happened on my other computer as well and I "solved" the problem by replacing the chassis fan, which (like this one) had a 4-pin molex connector connected to a 3-pin adapter wire, with its brand mate (same model number, different suffix), which had 3-pin connector I could plug directly into the motherboard. That was the only significant difference between the two fans, but the latter was detected where the former was not. All I could say in response was, "Oh, really?"
Is this all I really need to do again? Could someone please tell me why the 4-to-3 makes it not work, if indeed that's the case? Thanks very much.
Motherboard: Asus P5KPL-CM
CPU: Intel Core 2 Duo E8400
CPU Fan: Arctic Freezer 7 Pro
Memory: 4GB Corsair DDR2-6400
Power Supply: Antec True Power 450W
Case: Antec Dark Fleet DF-30
OS: XP Media Center SP 3