I just bought a brand new computer Monday. It is a Compaq that came with a Lite-On 1633S dvd/cd writer.
Problem is, the 1633s is not accepting cd-r media. I put in a Fuji, and attempted to burn an audio cd through Nero 6.6 and it ejected the disc and told me to insert a blank. I tried 4 different discs just to make sure it wasn't a bad blank or two, and each time, nothing doing. So I went to the program PC Doctor , opened the tests on all drives, and under the Lite-On, it showed diagnostic tests for Ddv+, Dvd- and Cd-RW, but NOT Cd-r. Since that cd-rw diagnostic was the only one listed for cd media, I tried to insert a Fuji Cd-r and do the cd-rw test, it rejected the disc and asked for a cd-rw. There is NO mention of cd-r under the diagnostics.
I have planned to get up tomorrow morning and return the computer to Micro Center, but I just found this forum, and on the slim chance anyone is up this late that might have a possible solution, thought I would try.