TC Miami, first of all, welcome. Second, no boot/no display issues are actually very commonly attributed to several factors mentioned in the troubleshooting guide. Follow the link in my signature to jump to the troubleshooting guide.
Also, it is very, very helpful and important for you to post your system's components with complete part names (not just Gigabyte H55, for example). One of the important reasons that you list your parts is because power supplies made by reputable manufacturers don't often fail to power up a system.
In short, work through the troubleshooting guide first, and if that still doesn't help you with your "no power" concern, come back with a list of your hardware.