No power to camcorder even when battery is fully charged

You should take the camera to an Authorised service centre.

I got hold of Canon support. I had the same problem. Got a new battery, fully charged and would not run the unit. Canon told me to do a system reset. pull out main battery and aux battery (bottom of unit) and to power switch to aux for 90 seconds. the put batteries back and it should work. Hope this helps.

Please check whether the Camcorder is fully charged. Then, try resetting the Camcorder to the factory settings. Try Power resetting the Camcorder.
To Power reset the Camcorder, remove the battery of the Camcorder press the ON button(if switch, then keep the switch in ON position) for 30 seconds and reinsert the battery in 1 minute. Then, check the operation of the Camcorder.
If the issue still persists, then service will be required. It seems to be an issue with the CCD of the Camcorder.

I have had mine for 1 year, two months. Earlier, it booted up, and I scrolled by date to locate some older footage. Then the cam just froze up. It wouldn't power down, so I removed the battery. Replaced batterie, and booted it up, located my older footage, and it did the same thing again. Now, when I power it on, the light blinks, the "access HDD" light stays on, but it won't power up, and my computer does not see it. It is also not making that "camera on" sound that it did before. I love this camera and have never had a problem w/ it. This just happened all of a sudden. Any ideas, anyone? I even pushed the "reset" button, but even though it lights up, it won't boot up.

I have a similar problem. My MV650i works from the mains power but not from the battery even though I have tried new battery packs.

It's the battery, over time the amount of power that the battery can store diminishes, and the indicator will still show a full charge, even though it is not fully charged. try getting a new one, from sony, or a 3rd party supplier. ;)

it does have fuses and are located inside they kinda look like resisters and are most likely the problem

you need a new battery

This camera has had problems with the primary switch block faulting. The camera will power up all by itself when unattended and drain the battery. Another symptom would be the battery refuses to charge fully because the camera must remain in the "OFF" mode for the charge process to begin. Sony in Laredo, TX is replacing these controls at little or no cost, I would call them to see if they will repair this for you. Hope this helps you. Joe Weibel Custom Electronics (customelectronics.org)

* Be sure the battery is connected properly. * Remove and replace the battery. * Connect the power adapter and ensure the battery is fully charged. * * The battery pack may be fully exhausted and require replacement. To ensure the life of your battery, be sure to remove it each time you are finished using the camcorder.