tablet not responding to pen

Test the pen

If your pen does not work properly, try these fixes first.

Note: The available features on your pen may vary depending on your device.

In the Wacom Desktop Center main menu, click Support and then Driver check to evaluate driver function and run simple troubleshooting, if necessary.
Go to the Pen tab in Wacom Tablet Properties and check that the settings assigned to the pen tip and pen buttons are what you expect.
If the assigned settings are as expected, restart your computer.
If restarting does not fix the issue, update your driver software.
If a driver update does not fix the issue, use the diagnose feature in Wacom Tablet Properties, as described below.

Open Wacom Tablet Properties.
If you have more than one device connected to your system, select the device you are using the pen with from the Device list.
Click About.
Click Diagnose.

Diagnostics window
The above screenshot is for descriptive purposes; it may not match your screen.

Hold your pen within 10 mm (0.4 inch) of the surface of the device while watching the Pointing Device Info. You should see a value appear after Proximity, Device Name, Device Type, and Device S/N (serial number).
Move the pen along the surface of the device. As you move the pen, the X Data and Y Data values should change.
Press on the surface with the pen tip and then with the eraser. As you are pressing, the Switches and Pressure values should change from approximately 0% to approximately 100% when you are pressing with full pressure.
Press the tip, eraser, and each pen button, one at a time. When you are pressing each pen button, hold the pen tip slightly above the device surface. As you press each item, the Switches number should change to match these numbers:

Move the pen from a vertical position toward the right and then toward the left. The X Tilt value should change to approximately +60 when you move to the right. The X Tilt value should change to approximately -60 when you move to the left.
Move the pen from a vertical position toward the bottom of the device and then toward the top of the device. The Y Tilt value should change to approximately +60 when you move toward the bottom. The Y Tilt value should change to approximately -60 when you move toward the top.
If you are testing an Art Pen, place the pen tip on the surface of the device and slowly rotate the pen on its axis. The Rotation value should change as you rotate the pen.
If you are testing an Airbrush, move the fingerwheel forward and backward. The Wheel value should decrease to approximately 0 when the fingerwheel is all the way forward. The Wheel value should increase to approximately 1000 when the fingerwheel is all the way backward.