Panasonic DV GS-120

I have Panasonic DV GS-120.After,when I plug in to me Laptop Mac Os x and download from camcorder movie,I have problem with playback,I have wierd vertical bars appeared over the screen camcorder and there was no sound.I used firewire connection
Before everything was good.
Does anyone have any suggestions on what to do?
Thank you.

Try to download your footage into another computer if it doesn't work then it's your camera, read the manual to see if you skipped any setting .