1, to charge a cell phone or digital products:
Check with the phone adapter or digital products match, also check if there are quality problems adapter; may be using a mobile phone or a digital product that comes with a USB cable, with Power Bank to charge a cell phone or digital products; individual phone models, using the phone comes with a data cable can not be charged, you can try using the Power Bank USB mouth 2nd and 3-pin short way to charge the phone
2, for Power Bank charging: 
Not to charge the Power Bank, check the computer USB port is working properly, check the connection if there is bad situation;

If USB charger, Power Bank to check whether the input voltage