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Most Goodman furnaces will have manual reset limits just above burners, See images below . Not sue why turning power off and back on would cause this though.Lets check these any way and we will go from here. Also let me know if you have a meter for troubleshooting.
Look just above burners on inside panel and give me furnace model.Also try killing power at breaker and then turning back on to see if board will reset.
OK the switch in picture one just turns gas valve on and off. Does not kill power to furnace.The resettable limits are shown here.Button pushes in to reset
Below is a diagram showing all the limits on the furnace. Since you do not have a meter, you can bypass one at a time by unplugging and connecting the two wires together to see if one is actually open.
OK if all limits are closed but board says open limit, board has failed.Did you have a power surge or anything earlier?
That really should not have caused an issue with furnace by nay means but we are definitely getting a false code if it is saying limits are open and we prove they are not. Possibly a coincidence.