My motorola s9 headphones wont charge when i plug them in, just two short green flashes and then a blinking blueish purple flash. whats up with that

You can indicators here: S9 Indicator Lights

Mark
Motorola Support

2 days old and defective return for refund or replacement

how to charge and switch on Motorola S9-HD wireless headphones...please help me

Blue (three flashes) powering on/enabling indicator light

Blue (steady) pairing mode

Blue with 10 quick purple flashes
pairing successful

Blue (long flash)
standby (connected but not
on a call or streaming music)

Blue (quick flash)
incoming call

Blue (long pulse)
on a call

these are all the normal blue flashes that the s9 makes

Try to press the power boton in the same time you plug the charger, after this action mine is working and charging perfectly, maybe this is the "reset" solution... Hope this helps you.

I had the same problem but instead of a red light it would flash green twice and stay off. I could not find the original charger and another plug in charger would not work. I plugged it into my computer with a usb cable and after several seconds it started charging.

This might work if you aren't using the ORIGINAL charger. I had this problem when my cat chewed through the original Motorola charger. I figured my Blackberry charger would work fine, but it didn't. I then discovered that my Blackberry charger was 700mAH and the broken charger was only 550mAH. When I found another charger with the proper power it charged. I also found that it worked when plugging it into my computer with a standard mini USB. I hope this helps.

From Falvey86: Hold the headset start button for about 10 to 20 seconds, the lights will start flashing red and blue, then the search for Bluetooth devices from phone and it will appear as: S9. press "connect", a window will appear, place the password "0000", that should do the trick!!!!

I had the same problem with a Samsung phone. There are two ways of fixing this; First, you can remove the S9 profile from your phone's bluetooth list, and then add it again, going through pairing and entering 0000 on your phone when asked for the code.
Alternatively, you might try pressing the "play" button on the right earpiece on the Motorola S9. This is supposed to kick it into the A2DP stereo mode for music listening.
Good luck.
And get a copy of the manual from the Motorola web site at http://direct.motorola.com/ens/s9/Headset_Home.asp I found this very handy for checking what the little flashing lights mean. When you get stereo reception, the little LED in the middle of the headset flashes green, not the usual blue and red and purple for voice calls. 
In case you didn't know, as a phone headset, with the microphone activated, you only get sound in your left ear, and the light flashes blue. For music, you get both ears, and it flashes green. So if it ain't green, you are in mono mode.

I just hooked it up with a usb sync cable to my computer. It was installed and ready to use and the charging light came on. Seems like it is charging as the led went from red to yellow, and it does turn on now. However, it still does not work with the usb cable plugged into a wall charger. If this solution works for others having the same issue kindly post your results.