1) It may be time to replace the lamp. If that does not fix the error it could be something more serious that would require service. What version of Lab Advisor do you have? you can download the latest from our webesite. agilent.com here: Download Firmware
What is the model number of your DAD?
2) Yes, you need 100% HPLC grade water in the flow cell.
3) Yes, you can toggle between the timetable and graph... what version of software are you running? please send a screen shot of what you are seeing.
thanks a lot for your answers...apparently I have some problem with my pump so I have contacted agilent support !!!
for the question 3 I found it thanks !