i have a HP pavilion a264w and i turn on the computer and the Blue LED light in front of the machine flashes on and then off. the computer runs but it doesnt boot. All the fans are working but it downst do anything. Prior to this happening the error that i was getting was insert proper boot media and restart. i opened the side of the machine and i noticed a lot of dust built up. i took a can of compressed air and i blew the dust out. Now the Blue light doent come on and it doeent boot either . i checked and reseated all connections and it is still giving me this problem. can some one out there help me?