Hi There, The solution I found for my Laptop. One of my memory modules was not working. The fix was to find the faulty Ram module and or replace both sticks. Solution: 1- Disconnect the power. 2- Turn the Laptop over. 3- Remove all the screw and pry open the back polycarbonate backing. 4- If you have 2 sticks of Ram remove 1 (to eliminate the one stick of Ram from being defective) 4a -Turn laptop over. Try rebooting. 4b - If that does not work, swap Ram and Try Rebooting. I found one of the memory modules (Hynix Brand) had failed. I replaced with 2 X 8GB Sticks of Ram and the Laptop works great. Good luck