I cant write dvd

Hello,
i have HP Pavilion dv4-1106ee Entertainment Notebook PC.
at first time i write the image cd.
that one finished fine.
after one month i tried to write a cd.
it is burned success.
after that i put a dvd disk and create a image file.
after that i put a blank cd, it is started burn, after 20% it is stoped .
pls give me a solution, i tryed so many times ,
i cant write dvd .
regards sha