stuck garage door
You stated "top panel" so let's go with a sectional panel garage door for now. But still a lot of guess work here.
"The top panel is past the track": Has the roller(s) come out of the track? IF SO then the roller(s) need to be put back into the track. Block up the door on the high side BEFORE doing anything. The roller(s) can be unbolted to get them back into the track if needed. You have disconnected the drive assembly, so you stated. Carefully-can you and a helper raise the garage door on the low side so that it is even and prop this side up so the bottom is level? IF you can get the door level and all the rollers in the track, I would see if I could carefully and slowly raise then lower the door to check operation. IF the door operates within the tracks fine, but seems heavy, then view to assess the cables and tension spring(s). As stated, IF you have no experience with these cables and tension spring(s), they can/will hurt you. David