The problem is i tried yo install a 3g modem and i found the memory in the laptop was not sufficient.so i removed the modem and tried to stop the installation process.it asked me to restart.i presssed forced restart.after that the laptop showed me logging off for some hours.so i left the system as such thinking it will switch off automatically.bt nw its on and nothing shows up in the window.please yell me hq to switch off and work normally.its a toshiba laptop