yeah man you will be fine, and in the very small off chance, you can always contact newegg tell them whats up and they you can send it back and you get a new one.
If the jumpers to the case buttons are not hooked up right, or one of the standoffs are shorting out the system, no it wouldn't have turned on even if it was plugged in to an outlet.
If the jumpers to the case buttons are not hooked up right, or one of the standoffs are shorting out the system, no it wouldn't have turned on even if it was plugged in to an outlet.