Ch. 1 on Behringer pmp4000 not working

SOURCE: Behringer SL3242 Mixer has a noise problem.

It sounds like you have ground loops. This is noise generated by having interconnected equipment grounded at different physical locations. Especially a problem if you have a cable from your cable TV provider connected into your equipment.
Remove EVERY connection into and out of the mixer. Plug in headphones. Noise? If so, mixer needs repair. If not, re-connect equipment 1 piece at a time and assess for noise. If it slowly increases as you add connections you will need expert on-site help to fix it. If it is sudden, what was just connected is the source and steps need to be taken to lift the ground on the connection to that equipment.

SOURCE: Get sound through a Behringer 1204FX mixer & FCA202 interface

Block diagram available here:
http://www.behringerdownload.de/XENYX_GRP2/1204FX_VIEW_Rev_A.pdf

Where are the trim controls set?
Those mics use both phantom and battery power; are the mic switches set to phantom?
Try using the CD/Tape outputs to the FCA202

SOURCE: Adobe Audition 3 Not Sensing Mic

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.

SOURCE: Behringer XENYX 1622FX, won't power on. Phantom power works(?)

After reviewing the schematic, I don't understand how the Phantom power can REMAIN on with the power switch off... this CANNOT occur except for what energy is left in the 48 volt supply filter cap... This might last for minutes after the fuse went... UNLESS you have devices connected which are backfeeding the 48 volts. (which would be a disaster)

The 48 volts, +/- 12 volts and +/- 15 volts and the +5 volts ALL come from the SAME switching power supply. I suspect one of the filter caps went or the primary switching regulator a TDP245Y chip.

You should ONLY work on the line side of this using an ISOLATION transformer since the line side has lethal voltages.

To do testing, one replaces the fuse and puts a 60 Watt light bulb in series with the hot side of the inout line. The lamp "acts" as a resetable fuse and limits the current for testing. When all is well again, the lamp will remain out with the power flowing through it.

The D1 diode bridge and C7 input rectifier and filter are first things to check. You can do those with an ohmmeter.

I will caution you to ALWAYS power any and all equipment from the SAME power source. Plugging in devices from across the room will set up ground loops and any ground fault will fry equipment.

SOURCE: On my Behringer UB1202 mixing

Does your computer Recognize the mixer. and to answer your question honestly Behringer is Junk they make cheap knock offs of really expensive products. but see if your computer recognizes it and if not i sugguest taking it back