Hi poperwog,
The easiest way to determine if this issue is a hardware or software failure is by performing a power drain. Here's how you will do it.
1. Turn off the computer completely.
2. Unplug the AC adapter from the power outlet.
3. Remove the battery from the unit.
4. Now, press the power button for about 15-20 seconds.
5. Put the battery back in and plug the unit.
6. Turn it on and observe the system.
If this did not work, it is a hardware failure (display issue).
Hope it helps.
Thank you for using FixYa.
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