Yesterday I was surfing the internet, not doing much of anything, no new updates, no new driver or hardware or software installs, just a slow day checking the forums. Everything seemed normal so I leave the computer to go do something for about an hour. When I come back and pressed the space bar (that is how I wake up my computer) the computer fires up but there is no picture on my monitor. It is dead. So I restart the computer and I can get the BIOS screen on the monitor, and I can navigate through the BIOS screen and on start up I can see the Windows emblem on the monitor, but after that it goes black again. So I dig out my old monitor and hook it up and it works perfectly. My main screen is a Samsung S24D360 hooked up by HDMI to my motherboard, I have no graphics card. My old monitor is a 19 inch HP hooked up by DVI-D. I uninstalled and reinstalled the Intel Graphics driver, I got a different HDMI cable off of my Blu Ray player and tried that, I scanned for malware and everything, but still no signal on my main monitor. I need help to figure this out. Thanks.