Q: Toshiba satellite c640 laptop screen going dark when charger unplugged My Toshiba satellite c640 laptop screen going dark, when I unplug the charger. 
On plugging charger screen is blinking for 5-10 minutes, then stops blinking.
Anybody know whats happening with my laptop?
Please don't consider this as a duplicate question. I have tried almost everything from other answers like adjusting power plans, replacing battery etc.


*

*How dark (off vs. dimmed)?
The screen is dimmed (too dark). But when I used my torch I can see screen contents. Please see image below


*What blinks when plugging it in again (entire display cycles on and off, or an indicator LED flashes)?
Entire display cycles on and off

*Does this happen on a fully-charged good battery?
Always

*How long ago did it start?
One week

*Were there any changes or updates before the problem started? How old is the laptop? 
No, I am just using my laptop to check emails. Nothing else. Laptop is 2 years old
