Lenovo Laptops ThinkPad Series


 * 11e Series
 * Chromebook
 * 13 Series
 * Chromebook
 * A Series
 * L Series
 * P Series
 * S Series
 * T Series
 * W Series
 *  X Series 
 * Tablet laptop
 * Chromebook
 * Edge Series
 * Helix Series
 * Twist Series
 * Yoga Series
 * Chromebook

Thinkpad info
Most Thinkpads have detailed hardware maintenance manuals. Due to copyright reasons, they cannot be displayed or linked here. However, they are easy to find using a search engine.
 * Thinkwiki
 * A bit outdated resource but contains lots of info on pre-redesign Thinkpads

BIOS modding
Old Thinkpads are the best supported laptops for bios modding. More info:
 * Coreboot
 * Libreboot

Troubleshooting
ThinkWiki has most of this info, like error and beep codes.