It sounds like you have something blocking the safety beam at the bottom of your garage door. Either that or the sensors have been knocked out of alignment. you wil need to check the area for something blocking the beams and/or the alignment.
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Now that you have explained the problem a bit more it sounds like you have a definate control board problem.
Unfortunatly the only cure is a new board.
When you return tonight (to a full garage I sincerly hope) please get the model number, and the make of the unit to me, and I'll see if I can find the board for you on line.
Do you have a college in your town? If you do they all have bulletin boards for students looking for extra work. I'm sure that there is a bright young man, or woman that can fix your door opener , AND program your VCR while they are at it. And they would happily do it fot 1/10 what the so called repairman was gonna soak you for.
But I will need the model number to find the correct part.
Please let me know when you get the model number, and Ill find that part fot you.
Thank you for accepting.
Best regards; The Home Smithy