Open your case and on the motherboard near the battery ther is a three pin jumper the jumper is on 1and2 change it to 2and3 leave for 10 seconds then put back onto 1 and 2 ,make sure your system is switched off before you do this, boot her up and it should start up go into your bios by tapping delete when booting up and reset date time , dont clock your system unless you know what you are doing, good luck.