Volvo Repair: Wont start, flash flash flash, example 121

Question
Without warning, my 1995 940 (4-cyl with 140,000) would not start. Car turned over but just would not catch, almost like the coil wire had been removed; it wasn't.
Gas is 3/4 full, fuel pump fuse is good, battery is charged. Everything seemed connected. I even tried all the mystic stuff, floored the gas peddel, shifted to netural, turned the radio down and prayed. No go.

Thank for your help.

Cheers ... Rick


Answer
first check for codes.

in the engine bay on the drivers side near the strut tower there is a small black box with a wire attached to it.place the wire in the terminal marked 2.turn ignition key on (not started)press the small button for 1 second and the code will be displayed as a series of flashes.a red led displays the codes.the code will be three digits.small pause in between flashes for a single number long pause between flashes for the next number.example 121 will be flash.....flash..flash.....flash.repeat three times or until first code repeats itself.to erase the code after all codes have been checked hold the button for a good 5 seconds then release the light should light steady,then press for another 5seconds.this will erase the codes.  email me the codes and i will tell you what they are..socket 2is the fuel system 6 is ignition.