It takes forever to get my computer to turn on. The monitor will go black and a little box in the upper left-hand corner will come on saying digital/analog and then it goes black and does nothing. You have to unplug it to get it to come back on. Sometimes it will bring up windows and then it will go black again. The same time this started happening, websites that I routinely visit will say something about a security certificate and not to go there. I don't know if it's just a coincidence or not. Someone said my graphics card is going bad. Could that be it? I sometimes have to unplug it four or more times before I can get it to come on and stay on.