HP Zbook freezes


New member
I have an HP ZBook 15 G3 that has developed a problem. If picked up by the lower left hand corner the screen freezes. nothing responds. The only way to shut if down is to hold the power button down. I can restart and it will work fine until it is bumped or picked up on the left lower side. Looking for some trouble shooting ideas, please.
I have eliminated the battery by unplugging it and running on AC power and still have the same issue.