Before attempting any repairs, check out the troubleshooting page.
Background and Identification
The Lenovo Yoga 2 Pro is a hybrid laptop/tablet with a 360 degree range of screen motion. It was released October 2013, and has since been replaced with the Yoga 3 Pro. You can differentiate between the Yoga 2 and the Yoga 3 by the hinge on the inside-- the Yoga 2 has a long bar the color of the outside case between two main hinges, and the Yoga 3 has a series of smaller hinges and bars.
The Yoga 2 Pro comes standard with a 4th Gen Intel® Core™ i7 or i5 Processor, operating on Windows 8.1, with 8 GB of RAM, and 512 GB SSD. It's extremely lightweight, at only 3.1 pounds, and, at only .6 inches thick, it's very portable. A single battery charge lasts up to nine hours, and can last six hours even while streaming HD video continuously on its 13.3 inch QHD+ display.
For Lenovo's support page, click here. [Lenovo has announced forthcoming discontinuance of support for the Yoga 2 Pro.]
For the full user guide as a downloadable .pdf, click here. [There is a link on this page to get the Hardware Maintenance Manual as well.]
For more information on the Yoga 2 Pro, as well as additional references, check out the wikipedia page here.