I just bought a mxl 3000 microphone from somebody and its just the mic and thats it no otha parts and when i hooked it on my boss br-1200 recorder it dosent work i know its not the cable cause i tested my otha mic on it and it works please help me

Here is an answer to your problem:

X2u XLR to USB Signal Adapter

Instruction on the web page

Hi,
you can't just plug and play with these high end mics. You require a +48v phantom power source from something such as a mixer. Then plug the mic into the mixer and the mixer into the LINE IN on the PC

perhaps there is agrounding issue or the impedance matching is not set properly for this type of condenser mic

look at these reviews

http://www.soundonsound.com/sos/aug05/articles/mxl.htm

http://homerecording.com/bbs/showthread.php?t=163441

hope this helps

Are you using the original cable for the mike? In order to use phantom power the XLR connectors have to be wired in balanced configuration. Pins 1,2 and 3 must be wired separately. If you use a cable with 1and 3 connected you could damage the phantom power supply and in some cases the microphone.

Check the input and output settings. Look in the preferences or settings menu for "i/o settings" or "i/o setup." You're going to set it from the default internal mic input to this one. It sounds like it may be that simple.

Make sure you've switched your sound input from the default (internal mic/input) to the MXL 990. This should be somewhere in the sound options.

If you're sure it's not getting power, you need to send it back.

Your other preamp does not have phantom power to supply power to the microphone. All condensor mics like this need phantom power. The Audio Buddy provides phantom power, which is why it was shipped with those condensor mics

The MXL 990s requires 48 volts to operate. If your mixer does not have a phantom power option, you will need to purchase a microphone pre-amplifier with phantom power to interface the microphone to your mixer.

Sounds like the frame of the microphone itself has become ungrounded. You could try VERY
carefully disassemble the mic and check for a bad ground or a bad wire connecting to the mic
body.

You will need to run the mic through a mixer that has phantom power. Without the phantom power supply, the microphones active circuitry will not be able to work.. Good luck, any problems getting your rig up just ask. A "FixYa" rating for assistance would be great, thanks