No display on Toshiba Tecra 550CDT

I loaded a computer game (demo version)on my laptop, Toshiba Tecra 550CDT, which runs Windows NT workstation.

After running the game for a few minutes the computer froze. I reset the computer, but after doing that I am not getting any display atall. The indicator light suggest disk activity but nothing is displayed on the screen.

I tried using the boot disk, but still no display.

Please help.

Aashish