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4. Verify the ac power source is working by attaching another device to the outlet.<br />
5. Remove the computer from a ThinkPad Ultrabase Series 3. Refer to “Detaching a ThinkPad Ultrabase<br />
Series 3” on page 153.<br />
6. Remove all devices and then test for system power with minimal devices attached.<br />
a. Disconnect the ac power adapter and all cables from the computer.<br />
b. Close the computer display, and turn the computer over.<br />
c. Remove the battery. Refer to “Replacing the battery” on page 116.<br />
d. Remove the memory (SO-DIMM). Refer to “Replacing memory” on page 143.<br />
e. Remove the PCI Express Mini Card. Refer to “Installing and replacing the PCI Express Mini Card for<br />
wireless LAN/WiMAX connection” on page 131.<br />
f. Remove the hard disk drive and solid state drive. Refer to “Replacing the hard disk drive” on page<br />
125 and “Replacing the solid state drive” on page 128.<br />
g. Wait for 30 seconds, and then reinstall the SO-DIMM and the known good battery or the ac power<br />
adapter to test the computer with minimal devices attached first.<br />
h. Reinstall each device one at a time that you have removed in the earlier steps.<br />
If your computer does not run on battery power, check the following items:<br />
1. Remove and reseat the battery to make sure that it is properly connected. Refer to “Replacing the<br />
battery” on page 116.<br />
2. Swap batteries with another similar model, if available.<br />
If another similar ThinkPad model is available, then verify that the battery pack works in the other<br />
computer and that the battery pack for the other model works in this computer.<br />
3. Verify the battery-status indicator. Refer to “Status indicators” on page 18.<br />
The battery-status indicator is normally illuminated whenever the battery is installed and the computer is<br />
on, or the ac power adapter is connected and the battery is charging. This indicator may be blinking or<br />
solid in either orange or green color depending on the status of the battery.<br />
A power button problem<br />
• Problem: The system does not respond, and you cannot turn off the computer.<br />
Solution: Turn off the computer by pressing and holding the power button for 4 seconds or more. If the<br />
system is still not reset, remove the ac power adapter and the battery.<br />
Startup problems<br />
Print these instructions now and keep them with your computer for reference later.<br />
If you receive an error message before the operating system loads, check the following item:<br />
• Follow the appropriate corrective actions for Power-on self-test error messages.<br />
If you receive an error message while the operating system is loading the desktop configuration after the<br />
POST is completed, check the following items:<br />
1. Visit the <strong>Lenovo</strong> Support Web site at http://www.lenovo.com/support and search for the error message.<br />
2. Visit the Microsoft Knowledge Base homepage at http://support.microsoft.com/ and search for the<br />
error message.<br />
Sleep (standby) and hibernation problems<br />
• Problem: The computer enters sleep (standby) mode unexpectedly.<br />
230 <strong>User</strong> <strong>Guide</strong>