It sounds like some hardware component or its driver is not cooperating.
What type of video connection do you have to your monitor? In some cases, the HDMI connections were causing problems.
If you have external devices, unplug them. If you can disable any devices in the bios, like network adapter or sound, you might try that.
During boot, can you hit F8 and get to the repair options where you can choose to use basic video or disable driver enforcement?
If none of that works, you might try booting to the Install DVD and do a repair install, which is an option you can get to by selecting "Repair My Compter" on the second page of the install process windows.