If you forgot to back up you can always put the HDD in some USB case or on some cable like a like to follow.
My Acer with AMD E350 processor is just 12 months old, which had win7 disturbance problem twice and third time while tried to go for 'completely factory default' option with recovery disk, it just went off and now while I press the power on switch, it just gives five blue blinks and then it is off !!! What is the solution ??? Can anybody help ???