I don't think pictures should be necessary, but if you'd like to post them for others, you can go for it.
If you have not done so already, you should check and make sure that all power cables to the components inside the computer are properly connected. If you have already done this, you should try and test the power supply. There are multiple ways you can do this; the method I use for testing PSUs is with a multimeter, since that is what I have. However, if you happen to own a PSU tester, you can also use that, or you could use a different power supply.
As I said, the method I am most used to is using a multimeter, as I own one. Here is a link to the instructions I use: http://pcsupport.about.com/od/toolsofthetrade/ht/power-supply-test-multimeter.htm
If you have a multimeter you can use to test that, please do! Otherwise, if you own another PSU, try substituting that one in to see if the computer will work.
Good luck, and feel free to ask if you need anything else!