The graphics chip can come loose. It's located under the keyboard, about where the space bar is. You can try pressing down firmly, but gently, on that area and see if it pops it back into place. You can also remove the keyboard and press directly down on the loose corner, very very carefully. If it starts, you may have to repair that solder point, or use a wedge of some sort to hold the chip down.
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The GPU is mounted on a small circuit board, and then the circuit board has a method of mounting to the motherboard.
With a Processor, the chipset is also mounted on a small circuit board. On the bottom of the circuit board are pins. These pins go down into socket holes in the processor socket. (Or you have Processors with the socket holes, and the processor socket has the pins)
Instead of pins for mounting, there are round solder balls on the bottom of the small circuit board. On the motherboard area that the circuit board is to be mounted to, there are a matching number of copper pads. (We are talking REAL SMALL here. Copper pads about the size of a straight pin head, solder balls about twice the size of this period >. )
The circuit board with it's solder balls, is set into position on the motherboard with it's copper pads. Heat is used to melt the solder balls, and they solder to the copper pads.
Does it happen at a consistant time? Then check the power settings for the computer (screen saver and time to blank the screen.
Also, usually have a little latch of some kind that operate a tiny switch that turns off the backlight when you close the cover. Perhaps this switch is stuck on yours and the laptop may think you have close it. To find it, you must look for either a little spring loaded plunger on the keyboard side, or an opening on the keyboard side that something on the cover inserts into. All laptops have it, but they are all different. When you find it, push on it to verify it works.
There is a common problem with this machine; the mother board flexes and the processor mount partly separates from the motherboad. You tube posts a couple of solutions but they involve taking the laptop apart and applying heat from a heat gun to resolder the mount; it is not a solution for the faint hearted. Thinkpad/Lenovo might consider reparing the unit as it is basically a desgn/production defect but don't hold your breath.