If you have a restore point from a date when AllData worked:
ALLDATA relies on a third-party service called to "talk" to the USB key. If this service stops, the software won't see the hardware. Press Windows Key + R , type services.msc , and hit Enter. Look for Sentinel LDK License Manager or Hasplms . alldata hardware key not found
Historically, these keys came in two main forms: If you have a restore point from a
Understanding which type you have is the first step in troubleshooting. alldata hardware key not found
It sounds obvious, but loose connections are a primary culprit.
Most AllData hardware keys have a small LED light.