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Strange noise coming from PSU

post #1 of 6
Thread Starter 
i just installed 2 blue cold cathodes, my motherboard is off at RMA atm so i jumped the PSU, however when i click the rocker switch for the cathodes the psu starts making a buzzing sound.

any ideas people?
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antec 900 gaming
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post #2 of 6
Thread Starter 
just found out there, once i plugged the other case fan into the last 4 pin molex connector the noise stopped!!!
antec 900 gaming
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antec 900 gaming
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post #3 of 6
Any other devices hooked up to the PSU? It might need some 3.3v+5v load for cross loading.

Quote:
Originally Posted by noodle View Post
just found out there, once i plugged the other case fan into the last 4 pin molex connector the noise stopped!!!
Yup, sounds like a cross loading issue.
Once again...
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Once again...
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post #4 of 6
Thread Starter 
hmm can you explain to me what crossloading is please?
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antec 900 gaming
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post #5 of 6
do you have any components using your 3.3 or 5v rails?
you need to load them I think...

also, is the sound a high-pitched whining?
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Sager NP5165
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post #6 of 6
Crossloading is where there is very little load on the 3.3V and/or 5V rail compared to the 12V rail and visa-versa. On the secondary, there are usually two transformers. One for 12V and one handling 5V and 3.3V. These need to have a minimum load on them or they don't work properly or make the buzzing sound you heard. Since your cathodes are 12V, there wasn't enough load on the 3.3V or 5V lines. So a hard drive plugged in or a 5V fan should help stop the buzzing.
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