Pioneer dvd-rw dvr-106d

Hi i can burn a cd in my dvd rewriter but i cannot burn a dvd,it tells me their isnt enough power.i have tryed updating the firm ware following someone elses advice but it hasnt made any difference,i have also tryed uninstalling and re installing it following someone elses advice but no joy.Before it started doing this i was able to burn dvds with no problems.hope some one can help.Thank you