I have a compaq laptop that it keeps turning off and turning on. When i turn it on, it turns off in a few seconds and then turn on again and turn off again like a loop. I searched on internet and found some suggestion like reseating RAM and holding power button for 30 second without any cords or battery but they didn't work. The power button in my laptop is showing on so it can not be the problem with power cable.right now the screen is black. last night it freezed and the screen became like blue screen flash, that time i turned it off and after that it hasn't turn on correctly and keeps turning on and off.Is there any advice?