I have an HP Pavilion dv6700 Entertainment Notebook, running Windows Vista. Recently, it has begun stalk/hanging and the monitor become white with lots black dots, and fail to restart by clicking CTRL+ALT+DEL.I used the power switch button to shut down. After it shuts off, I cannot power the laptop back on immediately. It Powered and off frequently till I press Esc button on the keyboard,it showered to its on but nothing displayed on the monitor. Sometimes it boot up after dispay windows desktop and stalk again. Could someone help me or offer any suggestions please.