- Notes, cautions, and warnings
- Working on your computer
- Technology and components
- Major components of your system
- Disassembly and reassembly
- Disassembly and reassembly
- Troubleshooting
- Getting help
L-BIST is an enhancement to the single LED error code diagnostics and is automatically initiated during POST. L-BIST will check the LCD power rail. If there is no power being supplied to the LCD (i.e., the L-BIST circuit fails), the battery status LED will flash either an error code [2,8] or an error code [2,7].