You will not face a copyright issue on uploading a converted video filmed by you. Because that is your own property. Just upload it. Don't worry/ But make sure it was YOUR OWN property.
If it is on an SD card put it in the PC and recover your stuff. If it is on the device, you need to turn it on first. Having service on it is not really required.
I have Dell and my brother has HP. My system has a better casing but his system has a light with the camera and more USB ports. So for me, both are good. it depends on your requirements.