I talked to a friend of mine who knows about computers, and even he's never seen anything like this.
It's pretty simplistic, really. When I turn on my computer, it starts normally at first, but as soon as it would normally play the beginning tune and show the login screen, instead, the musical tone cuts off, and the screen flickers wildly at seizure-inducing speeds. I can see through the flickering the blue of the login screen, yet no profile icons or the text box. As well, I can see the little keyboard button, though its been pushed to the top left of the screen, and I can see and move my mouse normally (though the mouse icon itself relentlessly flickers, like the screen, between normal mouse, mouse with loading circle, and loading circle)
I have no idea what could be causing this, especially considering I just installed Windows 7 fresh all of 2 days ago. As the title says, I can still log in normally when in safe mode. I've heard a number of different opinions as to the cause, such as the prefetch/superfetch programs, possible faulty motherboard, the fact that I didn't do anything special even though I installed it onto a solid state drive, etc.
Any ideas on how I can solve this? I can provide further computer details if needed, as well as a list (that a friend had suggested I make) of every program that I install or alter from the initial Windows install.