I caint see how this would be because of a case... seeing as its not acrylic.
It's possible the power button up front was damaged in shipping, newegg isn't exactly known for being gentle with their goods.
Try plugging the reset into the power switch on the mobo, then hit the reset button. If it powers on, there you go.
And also see if the idiot switch on the back of the PSU got flipped. It ought be on the line, not the O, thats if it has one.
If none of these things work, you may have to take it to a shop, as you might have a random hardware failure.