Why is my PC only showing a black screen?

For some reason my pc screen is not showing any images. It's a samsung syncmaster 193v and it's getting power and is connected correctly to pc, input has not been touched. The green power light is flashing and test screen works. The pc is a packard bell...

Upon pressing my HP's on switch, lights come on and fan as well, then a Shrill-pitch noise happens for 3/4 of a second followed by 2 identical-sounding ones which are each half that. {Beeeeep! beep, beep.} Not even the HP logo shows on my screen, for...

I was surfing online like usually and suddenly pc screen stuck with some dots over the screen. Restarted pc and screen was black... Please help!

ok like, ill be on utube or in wow or any application really, and as i change from one video to another or one toon to another, the screen will flash for 2-3 sec with some video or screenshot of something i had been looking at 20 or 30 minutes earlier...

how do i make what's showing on the pc screen show on the TV? There must be a way to do that.

how do i make what's showing on the pc screen show on the TV? There must be a way to do that.

Whenever i am installing adobe products, or any products; after the setup, the pc shows blue screen, something memory dumping and the PC automatically restarts, what might the problem, plz help. I m having core i3-530 @2.93 ghz and 2gb DDR3 RAM AND WINDOWS...

one day in the morning i turn on my pc normal and i used it really quit i left it on and went to school when i came back my pc didn't show image at all i turn ir off and change the cable but the problem get on please help me to solve this problem as...