My drive won't spin up any of my +R DL disks. Just my single layer +R's I use to backup my movies. The drive was made in December 2005. Tweaked the pots with no success.
I have another drive I tested from the same batch and it works. Using the logic board from my first drive and the laser head from the second good drive it worked.
I just went ahead and ordered 2 new laser heads. Can't wait to try. Should be here tomorrow.

Oh, and I was using two different verbatim disks. One was a 2.4x and the other was an 8x certified. I burned both at 2.4x.