After shutdown and install updates no hard drive is detected

I have a windows vista hp pavvilion a6137c desktop pc and the other day I was just doing what I've done casually for 3 years now is just surfin YouTube and what not. So after finishing up on the computer I decide to shut it down so I go and turn it off but I see the shutdown button has the "shutdown and install updates" alert so I hit it turn off the moniter and walk away. I come back the next morning and now when I Turn on the computer it reads "No bootable drives detected please insert proper media and reboot". I don't know all that much about computers so if anyone cam help me and be really specific on how to fix it it would be so deeply appreciated thank you.

 

just a simple problem that you encounter dude. there are 3 possible way, 1st, check your hard drive if it has loose attached to the connector..then 2nd.change the IDE cable connector to the new one. if you have extra well its good. In last but the least. change your hard drive and try to reboot.ok

 

no matter how pc are moderalized. it doesnt matter.

 

you must take computer lesson. so that you know the basic dude...