Dvd+rw problems

well ive had this thing for like 5 months more or less and its been working fine but now for some reason, it wont read my blank cds.

i put other cds with content on them and it reads them fine but the blank ones i wanna use to burn stuff on, those wont work. i tested 2 diff brands of cds and nothing. it was working fine yesterday so i dunno what the problem could be.

it reads the blank dvds fine but not the cds

any suggestions???