Front Screen Outer Glass Lens for iMac 21.5 inch A1311 2011 2012 About the product 1. Replacement front screen outer glass lens for iMac 21.5 inch A1311 2011 2012. 2. Replace your broken or damaged item with a new one. 3. Helps restore your device to a like-new appearance. 4. Designed to fit and function properly. 5. Each item is inspected and in good condition before shipping. 6. Professional installation is highly recommended. We are not responsible for issues arising after installation. Before Installation Notes 1. Test before installation When testing, do not remove any protective film or labels. Be mindful of static electricity. Before performing any repair, ground yourself using an ESD (electrostatic discharge) strap to prevent damage to internal components. Wear eye protection and handle glass carefully to avoid injury from sharp edges. 2. Simulate testing Screen replacements are fragile. Testing before full installation is strongly recommended. Perform a test by connecting the motherboard, LCD or screen, o cable, and the new replacement, then power on. If the test is successful, proceed with installation. If the screen does not display, contact support immediately. Do not force installation if the test fails. Responsibility is not assumed after installation. 3. Avoid excessive cable bending Ensure the LCD cable is not bent beyond 90 degrees. Excessive bending may result in display failure or black screen.