Hi there. My Toshiba Satelite notebook screen is still dark when i boot up. the power light is on, the fan is working, the DVD drive has power. but the screen remain dark.this happens when i was installing the driver for for mobile phone, when the USB device tht was plugged in stopped working. Then i restart the pc, when it restarted nthing happens. the screen remains dark, so i disconnect and reconnect the CMOS battery. And still nothing happens. Help plese. Thank you