Why is my LCD Replacement Screen not working correctly?

I am a very tech savy person, formally worked with what used to be Compaq computers. I had a cracked screen and purchased a replacement and upon initial boot the screen worked correctly. Then after putting the computer to sleep and waking it the next morning, the screen no longer works. All I get is a bunch of colors and lines and no readable windows or text. I can barely tell there is something in the background but it is completely unusable now. The external display output works just fine.

Any ideas? Is it just a defective screen? Weird that it worked at first though.