Sony HDR-CX440 How To Use Manual page 163

In case you have not used this product for several months, check the following
before use.
When the date and clock settings are initialized, reset it by selecting
[Setup] - [ Clock Settings] - [Date & Time Setting].
Be sure to charge the battery of this product before use. For details, see
"Charging the battery pack using the AC Adaptor."
It may be required to change the movie format to view images recorded in the
past. For details, see "Playing MP4 Movies ( HD movie) (switching the movie
format)."
[178] Troubleshooting
If you have problems
If you run into any problems using this product, follow the steps below.
1. Check the items under "Troubleshooting," and inspect this product.
2. Disconnect the power source, attach the power source again after about 1
minute, and turn this product on.
3. Perform [Initialize].
If you select [Initialize], all settings, including the clock setting, are reset.
4. Contact your Sony dealer or local authorized Sony service facility.
Note
You may need to initialize or change the current internal memory (Models with
the internal memory) of this product depending on the problem.
If you do so, the data stored on the internal memory (Models with the internal
memory) will be deleted. Be sure to save the data on the internal memory
(Models with the internal memory) on other media (backup) before sending this
product for repair. We will not compensate you for any loss of internal memory
(Models with the internal memory) data.
During repair, we may check a minimum amount of data stored on the internal
memory (Models with the internal memory) in order to investigate the problem.
Troubleshooting If you have problems
-