My computer after a reboot gives one longbeep

Hello,

I just restarted my machine after installing the microsoft office 2010 off their website and when I rebooted it my machine no longer will show any picture and it makes one long beep then nothing. I have tried pulling out the ram sticks, I have two, and putting them in different slots but it does not change anything. Even tried pulling one out at a time. I checked the cables on the back and on the monitor, aside from the typical connectors not connected inside (I didnt touch my machine when it rebooted, did it from on the computer).

What is wrong? I even tried taking out my video card and then putting it back in. This machine is only a year old.