Hi... I see no one replied to you for, about, 20 days...
I've had the same problem with same notebook.
I have reinstaled Windows 7 x64.
I think my problem occured after instaling DaemonTools.
I think i did a mistake by buying ASUS when i have gotten ACER for 2 years with no problems, i think i should have bought MACBOOK. Italy
yea im having problem Hl-dt-st
dvdram gt30n, where can buy another or is there like a warranty on it. asus is a huge company, but bad service no one answer