Hi there! I understand you're having trouble with your iTouch Wearable Active 4 showing a blank screen and not being able to pair with the app. Let’s work together to get this sorted out.

First, let's try turning your smartwatch back on. Here’s what you should do:

1. Power On: Tap and hold the one-touch button on the side of the watch for about 3-5 seconds. You should see the Active 4 logo appear if the device is powering on.

If the screen remains blank, it might be a charging issue:

2. Check Charging: Make sure your watch is charged. Connect the charger and leave it for at least 10-15 minutes to ensure it has some power. Sometimes a watch can turn off completely when the battery is very low.

3. Reset the Device: If the watch is still unresponsive after charging, you can try resetting it. To do this, press and hold the one-touch button for 10-15 seconds to force a restart.

After trying these steps, let me know if the screen turns on.

Next, for the app pairing issue, please ensure these steps have been completed:

- Bluetooth: Ensure that Bluetooth is enabled on your phone, and that no other smartwatches are currently paired with your phone. You might need to unpair them if there are any.

- App Reinstallation: If the app still cannot find your watch, it can be helpful to go to the app store and reinstall the iTouch Wearables app.

Once your watch is on, try opening the app again to see if it can pair. Please share with me if any of these steps resolve the issue or if you’re still facing difficulties. I'm here to help!