For iMac 24 inch A2438 A2439 A2873 A2874 Front Screen Outer Glass Lens Before Installation Notes Tips 1: Test before installation When testing, do not remove any protective film or tags. Please pay attention to the problem of static electricity. Before attempting any repair, be sure to ground yourself with an ESD (electrostatic discharge) strap. This will prevent static electricity from damaging the electronic components within the device. Ensure you wear eye protection and use caution not to cut your finger with glass splinters. Tips 2: Simulated testing Screen replacement is a very fragile product. We strongly suggest testing before installation. Please perform simulated testing, which means disassembling the device, connecting the motherboard, LCD or screen, audio cable, and new replacement, then powering on to complete the test. If the test is successful, proceed with installation. If there is no display, immediately. Do not force installation. We will not be responsible once the screen is installed. Tips 3: Do not over-bend cable Please make sure the LCD cable is not over-bent. Bending beyond 90 degrees may cause black display. About the product 1. Replacement front screen outer glass lens for iMac 24 inch A2438 A2439 A2873 A2874. 2. Replaces old, broken, cracked, or damaged glass. 3. Restores the appearance of your device. 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 will not be responsible after the screen is installed.