I got a used MOTOROKR wireless headset. When I plug it into my MacBook, the light flashes green (I assume that means it's charging) for some time, then turns red. Then the light goes out and the device does nothing. If I hold the power button while it's plugged in, the light will flash blue instead of green. If I unplug the headset, it becomes unresponsive. My MacBook Pro can't find it to connect.

Hi, Ephraim. The flashing red light indicates that the device is showing "low battery". It could be that the LG phone charger fits the charging port on your bluetooth headset but it is not compatible with your device. In order for you to know that it is charging, the device should show a steady red light(means charging).
Please take a look at the table reference below.
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•With the Charger Plugged In
______________________________________________________________________
•Headset Indicator Headset Status
Red-----------------------------------------------Charging (battery level less than 50% charge)
Yellow-------------------------------------------Charging (battery level more than 50% charge)
Green--------------------------------------------Charging complete
----------------------------------------------------------------------
======================================================================
======================================================================
======================================================================
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With No Charger Plugged In
__________________________
Headset Indicator Headset Status
______________________________________________________________________
Off ---------------------------------------------Power off
Three blue flashes------------------------Powering on/off
Steady blue --------------------------------Pairing/connect mode
Rapid blue/purple flashes -------------Connection successful
Quick blue flash --------------------------Incoming/outgoing call
Slow blue pulse --------------------------Connected (on a call)
Slow blue flash ---------------------------Standby (not on a call)
Slow red flash ----------------------------Idle (not connected to phone)
Slow purple pulse -----------------------Connected call muted
Steady red ---------------------------------Attempting to connect
Quick red flash ----------------------------Low battery

Note: After 20 minutes on a call or of inactivity, the light stops flashing to conserve power, but the headset remains on
----------------------------------------------------------------------

Hope that'll help you in some way.
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http://www.youtube.com/watch?v=Sm8cSkyTmfA
try this...

Mine is doing the exact same thing. Does anyone know what the problem is? If so, what is the fix.

Hello, you can download the manual here: http://www.plantronics.com/us/media/media-resources/literature/user_guides/73156-01_CS55_US_DL.pdf?WT.dl=20 It says that a flashing amber light means charging, a solid amber light means charged, a solid red light means power, a solid green light means talking, and a blinking green light means muted.

This is caused by a power surge. To correct, plug your headset into charge, and then plug into power strip. Trip the switch on the power strip to off. It will cause a drain and turn off your green light and then allow the headset to turn back on.

Try a system reset:
1.  Lift the headset off of the charging cradle, but make sure the headset is turned off.  It will be off if the green light on the front of the base is not lit.  If it's not, push the call answer button once to turn it off.
2.  Push the call answer button and the mute button at the same time and hold them down.  The mute button is the black little wheel at the top of the headset.  Use the tip of your finger to push it straight down and hold it while holding the call answer button.  A green light on the headset will flash for 2 series of flashes.  Wait until the end of the second series then let go of both buttons.
3.  Put the headset back on the charging cradle and wait 30 seconds.  Lift it back up and try to use it.  If this doesn't work, repeat one more time and then disconnect the power from the base and plug it back in.

Try a system reset:
1. Lift the headset off of the charging cradle (the base).  Make sure the headset is turned off.  The green light on the base won't be on if the headset is turned off. 2. Hold down the call answer button on the headset at the same time as mute button.  The mute button is found on the little black wheel on the top of the headset.  Use the tip of your finger to push it straight in. 3. Hold both buttons until you see a green light on the headset flash.  It will be right below your thumb.  Hold both buttons until the green light flashes for a series of 2 flashes.  Then let go of both buttons. 4. Put the headset back on the charging cradle and wait 30 seconds.  Lift it back off and try again. 5. If this doesn't work repeat the process once more or try a resubscription.
Resubscription procedure:
1. Put the headset back onto the charging cradle.  Make sure the red light on the base is on and the yellow light is flashing. 2. On the back of the base there are two buttons for the microphone adjustment that can be pressed down.  Press both of those down until the red light and yellow light on the front of the base start flashing. 3. While the headset is still on the charging cradle press and hold the mute button until the red light on the base goes solid, and the yellow light stays flashing. 4. Unplug the power to the base and then plug it back in. 5. Wait 20 seconds and try.

I have had no trouble with mine (3+ months of good use) until today. Same problem you had - green light won't go out, unit won't turn on. Jonsumer's solution got me to thinking, and this worked for me:

1. plug the charger into the wall.
2. plug the headset into the charger.
3. unplug the headset from the wall.

Plugging & unplugging the headset to charger multiple times had NO effect. It was only when I plugged it into the charger and unplugged the charger from the wall that the green light turned off and the headset began to work normally.

WEP-150, I put it on charge, as soon as I plugged it in, the light went red, then green, then it went off. It is not powering after leaving it over night. HELP!!!

blinking red and green means the headset is in pairing mode and ready to be connected to your phone. This means it is either the first time you have paired the headset or you have depressed the volume +/- buttons simultaneously for more than 5 seconds. If your phone cannot find the headset, it may be a compatibility issue. Try pairing the headset with a friends phone, possibly a sony ericsson. Good luck.