I am trying to set up my Raspberry Pi for the first time. I downloaded NOOBS from the Raspberry Pi website, and followed the instructions to format the micro SD card (was fresh out of the package anyway). I hooked everything up, but both TVs I tried it on simply say that there is no HDMI signal. I have tried multiple different power supplies. The red LED on the Pi is solid and the green one is flashing on and off. I appreciate any help.