well, it can be LCD itself or LCD flex cable. about graphics from what I found it has intel 4500, and that means that its integrated into chipset so very low possibility try moving LCD to different angles, if those "alien messages" appear then it means it should be flex, otherwise should be LCD.
This might be a initial symptom of some serious error in your laptop so rather than avoiding this symptom try to get it fix it by some expert.So that your laptop will run smoothly for more years
sorry, forgot to mention, also check LCD connector on mobo if you're moving lappy frequently maybe it just jumped off a little this is very low possibility by symptoms you're telling, but still it can be
Basically. You need to fully dismantle and check from the motherboard LCDV connector to the connector on the LCD itself. Things to check below. Loose connections Damaged to the LCDV cable Damaged/broken pins on the motherboard LCDV connector Motherboard LCDV connector has not come away from motherboard due to heat, etc Keep a watchful eye out for burn marks, even small ones, could have been a short Always have a look at the LCD Flex attatched to the back of the LCD itself Check for dust and clogging, may be slight overheating Before even thinking about disconnecting the LCD, take the battery out!