ive just purchased a mondeo 20tdci ,i owner auto,68000 miles,car goes great,but comeing home from hospital tonight,i put lights on,and the speedo,or rev counter dont work,lights stuck on full beam,and hazard warning light s showing on instrument panel,trip computer,and centagrade reset it self any ideas to whats wrong please,knock lights of every thing resets it self and every thing works until i put lights back on

dodgy earth some where?