I just got my laptop(Toshiba satellite L850-16T) back from repair for the last time(warranty is now expired), apparently they changed the motherboard and suddenly there are a bunch of green dots on the screen when my laptop is charging.
If the battery is removable shut down computer, take it out and put it back in again
Deplete the battery all the way to 0%. Recharge all the way back to 100%. Turn on computer.