Unable to reset VRAM or boot a 2007 MacBook in Safe Mode or otherwise
Your keyboard may not be functioning properly.  

If pressing ⌘ CommandV doesn't get you into verbose mode but you can can no longer get into Safe Mode (⌘ CommandS) there may be something wrong with the keyboard.

Try an external USB keyboard to issue the ⌘ Command⌥ OptionPR to reset the NVRAM.  (Alt = Option)

That should allow you to reset your NVRAM.  At this point you should test out the built-in keyboard and if it still isn't working, it's time to look at getting it replaced.