Computer not booting after switching case
I recently tried moving my Dell Inspiron 4600 into a larger case. After taking note of how all connections are set up, I proceeded to take everything out and move it into the new case. However, after getting everything in and pressing the power button, the computer won't boot up! Nothing turns on at all, not the fan, not the hard drives. I didn't change any of the equipment, I simply switched cases. The only sign of life on the computer is a green LED shows up when the computer is plugged in. Besides that, nothing.
Could my motherboard be shot? How would I go about testing the motherboard? What else do you think my problem could be if the computer doesn't boot at all.