Hello torben59,
you can check two things.
First: Its a very old system. You have the correct resolver values? Nobody change the motors or the mechanic?When you have a old backup (befor the boot), check this in the moc.cfg. 
Please look of the robot or in the controller, you will find a sticker from the values.
Second: After the reboot from the system, you must activate the parameters in the systemparameters. Check follow: Other windows --> SystemParameter --> Parameter --> Motor Calib --> Button from Resolver Values of yes.
Is this all ok, then move the robot in the zeroposition and check the calibration marks.
Is the robot in the correct position, you can do nothing more.
Regards
CSH
thanks for your quick answer 
. i had a serius failure and an abb guy advised me to reboot the system , nothing have been changed ( moto
rs etc.)
i will try this in the morning
thanks 
hello again , now everything is ok , thanks a lot for your help 
regards Torben59
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