Dell Precision M6600 (Mid 2011) - Manual (Page 6)

1. Verify the pen tip is in good shape (free of chips, excessive wear, etc.).
2. Replace the pen tip with a new one or the one that is in good condition.
3. Verify that the touch capabilities are not affected.
4. Switch to touch mode and see if the problem still exists.
5. If no symptoms persist in touch mode, the pen tip is the most likely suspect.
6. If the problem does persist in touch mode, run diagnostics and take the necessary steps depending on the results.
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