Screen goes black (blank) after reboot

I've been trying everything under the Sun to fix this particular problem without positive results. I 've read many and try some of the fix recomendations up in here but the problem still persist. My problem is that when my system reboot and I'm surfing the screen goes blank. I 've try the following; removed battery/unplugged laptop/ and drain excess of power. Removed RAM sticks and inserted back in. Checked and installed the latest drivers. I do not received any ERROR messages nor warnings. I ran Windows Memory Diagnostics Tool (Pass). The laptop goes black even starting in Safe-Mode. I Uninstalled-Reinstall Device Adapter Driver fron the Device Manager. The screen is litup but there is no graphics whatsoever (I don't have a bad screen). I just did a System Restore going back two weeks, but the problem persist. Laptop starts fine but a few seconds or a minute later the screen turns blank (black) again. Wow, I have a feeling that it could be the Display Adapter going bad? Hardware problem? Before this problem happen, the laptop was behaving like this but for a short period of time. I used to turn the system off and on then I used to hear the dvd drive make a sound, like connecting or something. The laptop used to be fine right and then. Now it doesn't do it.

Toshiba L675D-7052. Processor: AMD Phenom II N640 Dual Core Processor 2.90ghz. Memory RAM installed; 8gb. System Type: 64 Bit operation System.Display Adapter: ATI Mobility Radeon HD4200. Windows 7 Pro.Any help in addressing this problem would be greatly appreciated. Thanks!