Numeric error codes
2100Detection error on HDD0 (Main HDD)
1. Reseat the hard disk drive.
2. Replace the main hard disk drive.
3. Replace the system board.
Disabling the internal battery packBefore replacing any FRU, ensure that you have disabled the internal battery pack by doing the following:
1. Disconnect the ac power adapter and all cables from the computer.
2. Restart the computer. When the logo screen is displayed, press F1 to start the ThinkPad Setup program.
3. Go to Config ➙ Power ➙ Disable built-in battery.
4. Press Enter. A Setup Confirmation window is displayed.
5. Click Yes in the Setup Confirmation window. The internal battery pack is disabled and the computerturns off. Wait for a few minutes to let the computer cool.