Soh Wai Hoe :
how to do installation without internal screen. when i insect disc for installation bios wont display on external monitor and it show on internal screen. my laptop still work fine.
Are you saying that the laptop monitor works during BIOS but then switches to all black when Windows should be loading? If your laptop is working fine I wouldn't recommend formatting it. Formatting a hard drive won't fix a physically broken laptop screen.
If you can get the external monitor to work, and the laptop boots into Windows, but the laptop screen itself is switching to black when Windows is booting then it may just be a display setting issue. If you can boot to Windows with the external monitor try reducing the resolution in the display settings.