Tech issues because I'm an idiot

File: IMG_5988.jpg (59KB, 425x282px) Image search: [Google]

59KB, 425x282px

I have a Window 7 refurbished desktop computer that seems to not be kicking on for a reason I cannot determine. It is relatively new as it was ordered a few weeks ago and seemed to not have any issues once it was first set up, however I unplugged it and for some reason it stopped working properly. The power light turns on when I press the power button but shuts off once the button is released. The fans are running and the disc drive is working and everything is plugged in correctly, however there is nothing being displayed on the monitor. After reading tech support forums online, I have found that it may be an issue with the Mobo or hard drive, but there is no damage to the computer and it is all essentially brand new. Would you be willing to off your opinion on the matter? I don't know anything about computers (obviously) and I don't have any money, so is there any way to fix it without taking it in to have someone charge me to look at it and tell me it's broken?