Screen works during boot but goes black once loaded
I have a 2007 15" Macbook Pro that does not want to boot up correctly. When you turn it on the gray screen will come up with the Apple logo and the spinning wheel under it and then the screen blacks out. The computer is still working and if plugged in to an external monitor you can go to about this computer and it does not detect the internal screen. I have tried booting in to safe mode with no change and single user and verbose modes both work and show the text until the system tries to go to graphical mode and then the screen cuts out again. I have tried resetting the PRAM (opt+cmd+p+r at boot) and resetting the SMC by pulling the battery and power cord and holding the power button for 10 seconds. I dont know what else to try and am looking for input.
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