Command R not working when prompted at Repair Disk
I'm gonna start out letting you all know that I'm new to this and don't really know what I'm talking about, so please forgive me. I just really need help and will give all the information that I think you need to help me figure this out. I just don't understand why my Command + R doesn't restart the computer like it's supposed to. I've never added or installed hardware to my computer. Actually, I have only two or three software programs, if that.
I have a MacBook Pro, 2.2 GHz, 4 GB 1333 MHz, OS X Lion 10.7.5 (11G63)
The problem surfaced when I ran Disk Utility, and it came up with some errors. It said for me to restart my computer by using the Command + R, but it didn't do anything. I tried restarting the laptop 3 times, with a full Shutdown once, but it still won't work.
Mac Pro, Mac OS X (10.7.5)