Macbook Pro doesn't react to any key combinaton at start up
This occurs when there is no information on any hard drive that the computer can process. This means that at some point you likely accidentally deleted the recovery partition of your hard drive. There is no regular recovery partition so the computer has no idea what to do.

You need to have a bootable USB drive to do anything with that computer besides use it as a very expensive paperweight. Find a USB drive and someone with a Mac and make yourself an OS X (or MacOS) install disk. Then boot from that drive (by holding down Option during boot). Then wipe your internal drive and install the OS (which will automatically install a recovery partition).