Computer Hardwar _ IT Technology

  System CMOS Checksum bad, Real Time Clock Error- ThinkPad T431s S YMPTOM :  From a cold or warm boot, power on a ThinkPad T431s system using battery power only.    Plug in the AC power during the transition from POST to the operating system.  The system will reboot as soon as AC power is attached.  Once the system loads past the BIOS logo, the system displays an error of “0251: System CMOS Checksum bad” or “0271: Real Time Clock Error”. AFFECTED BRANDS :  ThinkPad AFFECTED SYSTEMS :  T431s OPERATING SYSTEMS :  Microsoft Windows 7 Microsoft Windows 8 Microsoft Windows 8.1 Microsoft Windows 10 WORKAROUND : If the failure occurs, starting the system without changing the power state will keep this failure from occurring. NOTE:  Do not apply AC power to the system during the boot process. 

  Lenovo    Track Point and Touch Pad not working  Model - L480 Customer complain track point ant touch pad not working after update windows, BIOS, Drivers. It may be happen - Disable - track point and touch pad Drivers issue  BIOS issue Keyboard track point issue . Motherboard issue  1. First check the Track point and Touch pad status. (Disable / Enable ) Steps for Windows 10 Enable Track poin t Go to control panel  ---> go to mouse properties. ---> go to Thinkpad tab ---> Click "Enable TrackPoint" Enable  Enable Track point Go to windows setting --> Type the "touch pad" and turn on touch pad.   Enable in BIOS - 2. Update the all drivers using Lenovo system update tool or Lenovo Vantage tool 3. Update the BIOS           * Reset the CMOS setting - press power button 10 sec.          * check the bios version - it less than version 1.26 please update to bios version 1.26.                    * BIOS version is 1.28. revert it to 1.26. You can download bios u