Black Screen On Startup "sleep Mode"

i wanted to shutdown my pc, so i press the red shutdown button in the start menu First odd thing happened: The computer went in some kind of "sleep mode" The screen was black, and my screen went in stand-by mode. The computer did not shut down. Whatever i did, the computer didnt go out of the sleep mode, smashed my keyboard, clicked my mouse, nothing happened. I was in a hurry so i had to shutdown my computer using the power button in my case. I cut off the power, and went away. The next morning, i plug the power back in and i try to start my computer again. The computer started the same way before i shut him down the day before: Fans are running, i dont hear my hard drive running, black screen, screen goes in stand-by mode after a few seconds. No boot menu, nothing immediately a black screeb Very odd, smashed keyboard again and again, pressed every button i could, but nothing happened. Even the leds on my keyboard werent lighted when the pc startsup, mouse does flicker.

Then i had the idea to maybe try and cut power again, and try again after that. So i did as i was thinking, cut the power, reconnected to electricity net, and start up again. This is when another odd thing happens: Everytime i cut power and try restart after reconnecting to power net, the pc goes to black screen fans running, shuts himself down again, and then immediately restarts 1 time. This happens EVERYTIME i cut power. After that he just stays in black screen, nothing happens. Does anyone know what is going on here? Yesterday he worked perfectly, but today he wont even start the bootup screen.