Welcome to Technical SUpport : please read and follow the check list below to help us help YOU ! 

Buzz Pro ,. I Pro , VvproV
troubleshooting check list

Batteries charged ?? ( use a voltmeter if you have one , they should read 4.2 volts each )
Take off the atty /carto first
Do you have a RED LED light ?
DO you have a Blue Led light when the button is pushed.
DO you have a Blue led with the ATTY/CARTO ON the unit ?
Do you have BOTH red and Blue led lights ?
Do you get a blue led with the atty/carto ON but no vapor ?

VVPV only :
dripping , does the drip system work ?
Does it pump out of the unit ?
is the tube cracked or crimped ?

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