Have you given each and every cable a good press to make sure it's firmly connected?
Recently I've moved my computer, unplugging and unhooking everything. When I brought it back, and hooked everything back up it wouldn't work.
When I press the power button, the fans and lights turn on for several seconds, turn off, then back on. Nothing is ever displayed on the screen, I've re-seated the RAM and GPU as well as replacing the CMOS battery. Nothing changed.
The main light on the front of the case comes on as soon as i plug the computer in which doesn't seem right.
I've had an issue before where I had to take the CMOS battery out and put it back in in order to get the display working.
Nothing happened during travel that I thought would have done any damage.
Any help or ideas is much appreciated.