Hello! I recently purchased a Lenovo 20JM000BUS Thinkpad T470 20Jm and for the first day it was working perfectly, however when I woke up the next morning the laptop's screen wouldn't turn on and there were two short beeps emitted from the laptop after about five seconds. Everything lights up on the laptop, just not the screen. I have tried removing the battery, resitting the DIMM, double checking the screen cables aren't loose, holding FN + F7 at boot, and holding the power button for 30 second increments. Any help would be much appreciated, thanks.