It wont fire up without any Ram installed, as the processor cannot function in any way what so ever.
whew *wipes forehead*
Try again when the ram arrives. In the mean time, pick a best answer?
PS. No, you havent damaged anything, Yes, disconnect the power completely before putting the ram in.
ram didn't solve the problem
Few things to check..
Make sure every connector is plugged in correctly.
Your RAM actually needs to be pressed in quite hard, I had mine pressed in lightly and my PC wouldn't work.
Your GPU needs to be pressed down a bit harder than you'd expect too, although less than the RAM.
Did you put the RAM in the right spots as well?
Also make sure you clipped the CPU in right, applied the heatsink correctly too although that shouldn't prevent the PC from starting up.
Make sure as well that the power supply button is actually turned on and the cable is in the socket correctly.
If all this fails you might have a bad case (my first build I got a case of which the power function didn't work, had to short it with a clip and it worked, that way I eliminated everything but the case)
The ram needs to be pushed in hard enough to secure the clips at each end.
Have you got the plus 2 pins pushed into the motherboard main power lead? If you have two enpty places on the main power socket it wont start.
Having examined the pictures closely, I feel you should look again at your case switch to motherboard connector. Get a lens, and look at the motherboard manual diagram closely. If you dont have that fiddly little connector on the correct pins nothing will start up.