I have a Dell Optiplex GX270. When I press the power button, the power button light turns amber, I hear some fans spinning, and the CD drive spinning. However, it never gets to the boot screen (or any screen). If I open the case and press the power button, however, the power button turns green and the computer works fine (loads all the way up and functions like normal). If I close the case after it has started, it continues to run fine. I'm guessing / hoping it's not the mother board or power supply that has directly gone bad... but maybe there is a connection or something? that changes from when it's closed to when it's open. I've heard of something like... the motherboard is shorting out by touching the case... but I'm not really sure where to look for that / how. Any suggestions would be appreciated! Thanks!