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Okay....I don't know if this will help, but this is one thing I learned about my Pfaff 7550. Sometimes it will look like the screen is lit up but there is no menu or anything and I have found that the "display lucidity control" dial is the problem. If you look just below the buttons that are in a semi-circular shape, you can see a really tiny little dial. It can be easily missed if you don't know where to look. What I have found is that sometimes the screen lights up but there are no words/menu and if you turn the "display lucidity control" dial, the words/menu will appear. As my machine has gotten older, it seems I need to do this more often. The first time it happened to me, I freaked because I thought the display (even though it was lit up) had blanked. THAT was when I discovered that teeny little dial that solved my problem. I don't know if this is your problem, but give it a try and see if works for you like it did for me. And by the way, if you need to see a diagram of the buttons on the Pfaff 7550, here is one. The "display lucidity control" dial is marked #23 http://www.manualowl.com/m/Pfaff/creative-7550/Manual/333556
The 7550 has a battery backup (little door on bottom of machine - 2 AA batteries). Remove batteries for a couple of days and the code should disappear. Removing the batteries WILL NOT effect the main memory of the machine - they are just for the backup of any personally designed stitches and memory combinations - not the hard memory of the machine. Periodically these batteries will need to be changed - a message will pop up on the screen to let you know.
Hope this helps (ex-Pfaff employee - GREAT MACHINE!)