PlzCanIHazHelpz

My start menu doesn't work so I can't use restart, shutdown, log off, lock, sleep or hibernate, neither can I use anything else on the start menu- for some reason my computer also doesn't pick up my headphones and continues to play sound through speakers- I think I left my computer in sleep mode for about four days with the headphones plugged in. Is there any way to fix this problem. (bearing in mind I can only shut down using the power off button on the keyboard and I can't use the restart function or Ctrl Alt Del).