If the green activity LED flashes and the amber status LED does not light up, the drive is recognized by the RAID controller and is working correctly.
If the green activity LED flashes and the amber status LED flashes slowly, the drive is recognized by the RAID controller and is rebuilding.
If neither LED lights up or flashes, check the hard disk drive backplane (go to next step).
If the green activity LED flashes and the amber status LED lights up, replace the drive. If the activity of the LEDs remains the same, go to the next step. If the activity of the LEDs changes, return to step 1.