Have you checked the wall adapter? If not please follow the below steps.
1. Unplug the AC wall adapter from the ColorFlex so that the four-pin connector can be accessed.
2. Plug the AC wall adapter into an AC outlet.
3. Use a voltmeter to measure the voltage between the outermost pins of the four-pin connector.
4. If the voltage is less than 14 volts, then replace the wall adapter.
If the AC adapter is good then the instrument will need to be returned to HunterLab for service.