Vantec UGT-PC341 User Guide - Page 11

steps: 1. Check that all cables are correct and securely connected. 2. Make sure USB device's power is turned on. 3. Make sure the devices are getting enough power they require. 4. Make sure there is no problem with the card installation.  Computer failed to start after inserting the USB 3.0 PCI Express card. Turn off the computer, remove the USB 3.0 PCI Express Card, and try to restart the computer. If the computer starts successfully, it means that the card has not been inserted into the PCI Express slot correctly. Please clean golden figure by rubber firstly, then change another PCI Express slot.  How to deal with there is a yellow exclamation point on controller? 1. Please shutdown your computer and move the card to another available slot then re-install USB 3.0 driver. 2. Please point on this device then right-click on the mouse. UGT-PC341 Page 11