Something crapped out between my mobo and cpu fan

[fortyways]

Here's my story, I'll try to keep it short.

I've been messing around with the front intake fans and the location of my HDD, opening the case up and moving stuff around every once in a while. Every time after I do so, I leave it open for a while to make sure everything's running ok.

I have an Intel socket 775 mobo with a 3.0GHz Pentium D and a Zalman 9700 cooling it - the version that's also compatible with AMD.

Once, after removing a 92mm fan from the front, the CPU fan didn't run upon booting up. the LED lit up, but not as bright as it should. I could get it to twitch back and forth by adjusting the Fanmate, but it wouldn't start. I hadn't touched the mobo to my knowledge.

I put the 92mm fan back, nothing. I returned the Zalman for the exact same product, nothing. The Zalman is connected to a 3-pin on the mobo and then to the Fanmate. When I plug a different fan into the mobo 3-pin, it runs fine. When I plug the Zalman into a different 3-pin, it works fine.

I doubt anyone knows what's going on with that crap, but if you do, great. An easier question I have is, how much voltage does the 3-pin on the mobo (Intel socket 775) have? I have the Zalman hooked up to a 12V right now, should I move it to a 5V?

Halp?

 

[PC eye]

I run the 9700 here on an AMD built with the spot on the board seeing 4 not 3 pins there. But that is 5v not 12v! Unplug that immediately before you cook it! The Fanmate would be the first thing to see a meltdown there. Try another place for a case fan on the board to see if you get power there. You may have bad solder point on the cpu plugin.

 

[fortyways]

Okay, I switched it from 12V to 5V. My board has only one 4-pin (for its little automatic monitoring thing where it cranks fans up to 3000RPM if it detects a temp over 20C), and the 3-pin that's giving me problems. I tried a 92mm case fan with the 3-pin and it worked fine.

The 5V I'm using now came with a Zalman GPU cooler. It has 4 connectors - 2 5V and 2 12V all for the graphics card. The idea is that the 12V are "normal" speed and the 5V are "silent mode."

The CPU fan is working with that but it shuts off or twitches if I adjust the fanmate in either direction, and the LED is barely lighting up.

Should I just get a new mobo?

edit:

By the way, PC, you were right about the 12V. I touched the Fanmate before switching and it was burning hot. You saved me a big headache, thanks!

 

[PC eye]

With the model there you have the optional vpu cooler kit. The one here is strictly seeing the large copper base and array of fins with the 92mm blue led. With this one I simply see the cord out to the fanmate and back to the 4pin spot for cpu fan seen on the board here. One pin is left exposed since that's a 3pin plug used here.

With the setup there it's probably intended to see 12v used since your are running two not just one single fan/cooler. That divides the 12v source two ways to cover the needs both of the fans have. But if you can verify that the cpu fan position is actually bo good that would be a board defect seen there.

Thonk you saw high temps? When first putting the 9700 in the new build right upon checking temps as soon as the first copy of Windows was on the cpu was seeing... heh? 107C! !!! The cpu itself never saw that while one fan blade on the 9700 was stuch against a pair of the array's fins.

When seeing that I stuck my over the 200mm opening on the top of the Antec 900 here and pressed the power button on the spot. yeaow! was that hot! The only found later when the board quit after the first days from something on it like bad caps or a bad bios chip was that the Artic Silver 5 application was entirely bonded to the bottom of the Zalman! Made cleaning off the old paste easier!