Problem starting up Dell Dimension XPS

Hello everyone, I have a dell Dimension XPS that I am having problems with. I had went to return the computer back from Standby recently. As the computer appeared to start back up, the  fans(unsure of which one it was)  turned  on really fast and loud. The computer monitor wouldn't turn on and wasn't responding when I was tapping a few of the keys. I was wondering if anyone else had experienced this issue?, or might know what is wrong? Your answers are greatly appreciated! :-)