User manual LENOVO H520S

[. . . ] Lenovo H520s Hardware Maintenance Manual ide aideaidea Centreidea Machine Types: 10093/2561/4746 Lenovo H520s Hardware Maintenance Manual Machine Types: 10093/2561/4746 Contents Chapter 1. Handling electrostatic discharge-sensitive devices . Locating connectors, controls and components . Replacing the front USB/card reader/audio module . [. . . ] • If you did not receive any error message look for a description of your error symptoms in the first part of this index. Hard disk drive boot error A hard disk drive boot error can have the following causes. Error The startup drive is not included in the boot sequence in configuration. No operating system installed on the boot drive. The boot sector on the startup drive is corrupted. FRU/Action Check the configuration and ensure the startup drive is in the boot sequence. Install an operating system on the boot drive. Attempt to back-up the data on the failing hard disk drive. Use the operating system to format the hard disk drive. Replace the hard disk drive. Power Supply Problems Follow these procedures if you suspect there is a power supply problem. Check/Verify Check that the following are properly installed: • Power Cord • On/Off Switch connector • System Board Power Supply connectors • Microprocessor(s) connection Check the power cord. Power Cord Power-on Switch FRU/Action Reseat connectors © Copyright Lenovo 2012 19 POST error codes Each time you turn the computer on, it performs a series of tests to check that the system is operating correctly and that certain options are set. This series of tests is called the Power-On Self-Test, or POST. POST does the following: • Checks some basic system-board operations • Checks that the memory is working correctly • Starts video operations • Verifies that the boot drive is working POST Error Message Keyboard error Description/Action Cannot initialize the keyboard. Make sure the keyboard is properly connected to the computer and that no keys are held pressed during POST. To purposely configure the computer without a keyboard, select Keyboardless operation in Startup option to Enabled. The BIOS then ignores the missing keyboard during POST. The BIOS was unable to find a suitable boot device. Make sure the boot drive is properly connected to the computer. Make sure you have bootable media in the boot device. Reboot and Select proper Boot device or Insert Boot Media in selected Boot device Undetermined problems 1. Remove or disconnect the following components (if connected or installed) one at a time. External devices (modem, printer, or mouse) b. Power-on the computer to re-test the system. Repeat steps 1 through 3 until you find the failing device or component. If all devices and components have been removed and the problem continues, replace the system board. 20 Lenovo H520sHardware Maintenance Manual Chapter 7. [. . . ] Remove the 6 screws that secure the motherboard to the chassis. Lift up the motherboard to remove it. Step 19. Line up the holes on the new motherboard with mounting holes on the chassis and secure it with screws. Reattach the memory module, Wi-Fi card, CPU, heat-sink and microprocessor fan to the new motherboard. [. . . ]