I'm about to tear my hair out! A few days ago I got the 'fantastic' idea to install SP2. I installed it, and then found nero had a compatibility problem - so I got the upgrade and I'm now running 22.214.171.124. Even with this version of nero I am still unable to burn dvd's - I keep getting a 'Power Calibration' error. At the same time, Record Now DX wouldn't even recognise that I have a recordable drive. So I updated my firmware for the Sony DRU-510A, and am now running 1.1a. It now recognises that I have a drive, but I keep getting error messages. I'm using TDK DVD-R, which is on Sony's list of compatible disks. Interestingly, I can burn CDs with the drive. Things I've tried - I've gone into Control Panel>Administrative Tools>Services>IMAPI CD Burning Rom Services and Disabled Start Up Type. I've also gone into My Computer Properties>Hardware>Device Manager>IDE ATA/ATAPI Controllers>Secondary IDE Channel Properties and changed the Device 1 transfer mode. I've unistalled XP SP2 and it still doesn't work. I've reinstalled the drivers and programs to no avail. Please help....I would really appreciate it.