When I power on my laptop (Satellite Pro L1500), it briskly flashes the Toshiba start up screen and switch to a lighted-dark blank screen, as though hands, until I press any key on the keyboard. Then it will display starting windows (Windows 7) screen and boot up. It takes longer time during this period. When finally up, it display a (system warning: A problem with the cooling system has been detected. Please turn off the computer immediately, and return it for service.) dialogue sometimes with a microphone-echo-unbroken-sound at the background, until I shut it down