Not able to write dvd on my len...

A power calibration error is caused by the inability of a DVD-RW drive to use a DVD-R or DVD-RW disk, it first writes a bit of a data on the DVD then uses it to calibrate itself for the position of the lines. This however can be caused by a number of reasons, so try the following options one after the other, If option 1 does not work, go to option 2, etc.

1:) Matshita has problems with some cheaper brands, get yourself a very known brand DVD as a test like pioneer or tdk

2:) Using a higher speed than the media is meant for, try lowering your burning speed in nero, try the lowest even, let's see if helps

3:) You have a Lenovo as you say. If it comes with Sonic, please uninstall Sonic first, then uninstall nero, then install nero again. Sonic and nero tend to conflict. But even if you do not have Sonic, reinstall nero and apply all new patches.

4:) If option 3 did not help, update the firmware, that helps in a lot of cases.

5:) If even option 4 did not help, disable IMAPI Service (Work's in most cases):
- Launch Control Panel -> Administrative Tools -> Services .
- Browse for "IMAPI CD-Burning COM Service", Right-click on it - and select properties.
- Change Startup Type to Disabled.
- Click Apply and Reboot.

6:) The burner lense needs cleaning, please don't attempt this at home if you are not a mechanic, take it to service they will clean it.

7:) Drive failure, or drive burning out -- then it needs to be replaced, if none of the above helped that is.

If you overlock your computer that can also cause this problem but since you use a laptop I assume you did not overclock it. Let me know if any of the above helped and what the results were.:)