1. Check and see if the device is connected to the computer. 2. Use a different data cable to see if the cable is damaged.  3. Try a different computer to check if the ports are good. 

Go to www.joyusing.com and click "Support - Download" to select the Software User Manual for your document camera. 

Please click the Focus and Exposure at the right corner, and cancel the automatic focus and exposure. See the picture below. 

The software download options are as follow: 1. Download from the CD came with the device.  2. Go to our website www.joyusing.com and then to "Support - Download". Please download the respective softwares according to the device models and computer systems.  3. Search Doccamera in APP Store from your Macs.