External Microphone Problems (PGC-FR415B)

[masteve93]

I have a PGC-FR415B Vaio. I am trying to use an external microphone connected to the MIC input. When no microphone is attached I get silence as expected. When I connect a microphone that works in other machines I get a loud hum at whatever volume I set the microphone input. Adjusting the input level and boost settings does not remove the hum. Has anyone else with this model found the same problem or is it just my machine? As I say I have tried a number of different microphones that work with other machines. Any help much appreciated.

[seb21__]

Mmmh, if you talk with your Mic. You must speak laud and clearly. As if you talk with a other person.

[kee-lo_]

Sounds like there's something in the machine too close to the soundcard.