What does 2 flashing blue light mean on the S9.

You can indicators here: S9 Indicator Lights

Mark
Motorola Support

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

Starting with your headset turned off, press and hold the power button for some 6 seconds, until the indicator light flashes alternately in blue and red. It is in pairing mode now. Then, make your phone's bluetooth application search for new devices. After a while the S9 should appear on-screen. Make it connect. If a paring code (or PIN, or passkey) is requested, enter '0000' (four zeros). The indicator light will flash some times and enter stand-by mode.
Hope it works for you.
Regards, Carlos

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.

The flashing red light is warning you that the shutter speed will be too long for handholding the camera. Put the camera on a tripod or other stable surface, and/or use the flash.

When using your S9 for the first time, follow these
steps to pair (connect) to your Phone:
Important: If you are pairing separate Bluetooth
devices for handsfree calls and streaming music, it is
recommended that you pair your S9 with your
handsfree device (phone) first.
1 Ensure the Bluetooth feature is enabled (turned
on) in your phone.

2 Turn on your S9 by pressing and holding (|) button
until the indicator light flashes three times in
blue.
After a few moments, the indicator light will be
steadily lit in blue to indicate your S9 is in pairing
mode.
3 From your device, perform a Bluetooth device
discovery/search. .
When pairing your S9, use
the following steps to perform a device discovery
from your phone:
After accessing the Settings Menu, go to bluetooth.
to add a new device, tap [New].
1. Tap [New] key to search the device that can be connected and which is
within range.
The phone lists Bluetooth devices it
finds.
b Select Motorola S9.
c Select OK or Yes to pair your S9 with
your phone.
d Enter the passkey: 0000
e Select OK.

When your S9 successfully pairs and connects to
your device, the indicator light displays blue with
10 quick purple flashes. If wearing your S9, you
will also hear an audio tone indicating successful
pairing and connection to your device.
4 To verify your S9 has successfully established a
handsfree calling connection with your phone,
dial a phone number you want to call and press
the Send key on your phone.
When successfully connected, you hear ringing
on your S9. A Bluetooth Handsfree Phone (HFP)
connection is now established with your phone

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.

Hello,..... when pair the S9 you must press and hold down the power on button till the led flashes blue and red...at this point it will be in pairing mode....