First off, after you get the screensaver, does it go back to the normal screen, or does it hibernate. Before anything, change your screensvaer to none, apply it, then rechange it and check if its works then. If it hibernates, then go to display properites (right click on main desktop, click properties), then click screensaver. At the bottom press POWER, then make sure it's set to never hibernate. Then, click hibernate at the top, and unchech the "enable hibernate" button.
I hope that helps