After assembling everything and hooking everything up we turn it on and only get a get a blue screen. The screen stays blue for a few seconds then turns black. The SD card is in correctly and the red light is on not blinking and the green light is on and blinking. Just will not boot. Is there a operating system I can download so I can try it on a different SD card?
If the red light is on and the green light blinks a lot for about 20 seconds and then blinks occasionally then the Pi is fine and it is probably the HDMI connector to the Pi.
Is the HDMI connector is firmly pushed into the Pi?
If you have another HDMI cable and a computer or TV that has an HDMI port, could you plug the Pi into that device and see if it works.