Measure the voltage output on the charger. Confirm whether it's good or not. If good, take out the battery and hold the power button for 30s. Connect to charger again without battery and try to turn it on. The Dell Venue 5130 Pro will turn on without a battery. Don't know which model you have but the 5130 variant that I serviced required input of 19.5V and 1.2-1.54A, so a regular phone/tablet won't do. There's a microUSB and some other proprietary port to charge that it had.