If the front USB port was properly connected, and it was working, then there are two most logical explanations:
-The front USB ports may lack adequate protection from power surge
-The Dazzle product can cause power surge and damage the USB header and other components on the MB
Never hot connect/disconnect an electronic device. That's just common sense. I don't care if it's USB or XYZ. This is a bad practice. If you're lucky, then the USB device will come with some sort of current-limiting device to reduce the amount of in-rush current and voltage. Mouse and keyboard are generally immune from this problem because they only draw about 100mA.
You should have tested the Dazzle product on the 2nd board with the power OFF. If okay, then we would know for sure that the power surge was the root cause.
-The front USB ports may lack adequate protection from power surge
-The Dazzle product can cause power surge and damage the USB header and other components on the MB
Never hot connect/disconnect an electronic device. That's just common sense. I don't care if it's USB or XYZ. This is a bad practice. If you're lucky, then the USB device will come with some sort of current-limiting device to reduce the amount of in-rush current and voltage. Mouse and keyboard are generally immune from this problem because they only draw about 100mA.
You should have tested the Dazzle product on the 2nd board with the power OFF. If okay, then we would know for sure that the power surge was the root cause.