Figure 4. Main Status Lights 1. Hard disk drive activity . • On: the notebook is accessing the hard disk drive. 2. Power mode . • Green: the notebook is on (even if the display is off). • Amber: the notebook is on standby. • Off: the notebook is off or in hibernation. 3. Battery charge status . • Green: the AC adapter is connected and the battery is fully charged. • Amber: the AC adapter is connected and the battery is charging. • Red: the AC adapter is connected and the battery has a fault. • Off: the AC adapter is not connected or the battery is missing. 8 Product Information zt1100/xz100 and xt1000 Series Troubleshooting and Self-Repair Guide