I had to reinstall windows on a HP Pavilion a820n and had to download an audio driver. I downloaded one but it was not the correct one, so then I downloaded Realtec AC'97 Audio. I can't remember what the first one I downloaded was, but I was trying to free up some space on the hard drive so I unistalled the Intel Accelerated Graphics Driver, because I thought it was the wrong one that I downloaded first. Since then (but I don't know if it was immediately after that or if it was something else I did that caused it) the option to Standby is grayed out. Did it have anything to do with it or is there something else I need to do to bring back the Standby option? Thanks for your help!