Hi.
If you have turned it off for more than a month then you have probably lost all of the programming due to the backup battery going flat.
See if you can print out a prog scan:
Turn key to P mode.
15 SUBTOTAL
1 PLU
10 PLU
5 X/TIME
CASH
You should get two reports. the first should show your products. Make sure the names are all there. The second should show clerk information. The clerk logon code may be in this info - the notes don't say whether it is. If it still says 'closed' when the key is in P mode and you can't get the reports, you will have to clear all programming and start again or take it to a dealer.
Mark
February 2009