It could be the media that you are using , mine will not load the memorex DL DVDs, the only ones that i have found to work for me so far are the 3 pack HP DVD+R DL discs, i bought a pack of those same discs in a spindle of 15, and they all were coasters, none of those worked, try to track yourself down some of those HP DVD+R DL discs in the 3 packs, those work great for me, also try the Verbatims, everyone says they work for them, tho i dont use them myself regularly, i do know they work because a friend game me a disc just so i could try and it works fine also, i have tried the memorex ones as well in the past and i could not get a single burn to load up, they all make that clicking noise and never load up, says unplayable disc, its extremely picky as to what media you use, so try another and let me know,
Verbatims or HP DVD+R DL in the 3 packs jewel cases worked, but not the HP DVD+R DL in spindle, those all turned coasters, and the memorex ones that i tried to use also did not work.
it was pretty annoying tryin to get something that works, but keep track of what you do and what you've done, you'll find your winning combination soon enough.
Keep on keepin on