If the inducer is running and the hot surface ignition glows, there is no need to jump out the pressure switch. Check for voltage to the gas valve as the ignore glows. You will be looking for 24 volts AC. If you get none, check for a safety device called a roll out switch. There may be more than one and they are located either right or left (or both sides) of the burner tray. They may have a small button between the two electrical connections that you can push in to reset the switch. If you can not reset them, jump out the circuit and try the furnace. If still no voltage, you have a bad board. If you are getting voltage, make sure you have gas and the gas valve is turned. If yes, you have a blockage in gas valve (rap it on the side) or a bad valve altogether.

Sure could, get them back!