Step 2: Connecting an external monitor to test the display
The notebook screen display might remain black when there is a corrupted graphics driver or a problem with the LCD display backlight. To test the display, attach an external monitor and restart the computer. Testing with an external display is helpful if the notebook display is black but you can hear sounds; such as fans, spinning drives, or beep tones that indicate the computer is operating.
Thanks for reply, thats a lot of info to get through. However, since I have tried all the usual cures and resets for what to me now seems a hardware problem, I will focus on the hard drive, memory and motherboard.
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