Are you sure you installed the correct RAM module? [http://www.crucial.com/usa/en/eee-pc-1008ha/CT977997|Crucial 2GB DDR2-800 SODIMM]
Are you sure you didn’t damage one of the wires or ribbon cables as it got caught the sheet metal or screw?
At this point I thing you’ll need to go back to the 1 GB module to see what happens. Did it work?