Hello, We have a replace argon laser and the system is working now. We are not really sure the argon laser is the cause. So, please in case something is not working, inform Daniel or me. Thanks, Enjoy imaging, Evelien Evelien Mylle - Lab Manager / Technician Advanced Live Cell Imaging VIB-UGent Center for Plant Systems Biology Ghent University Technologiepark 927 - 9052 Ghent - Belgium Tel. +32(0)9 331 39 34 [ http://www.psb.ugent.be/ | www.psb.ugent.be ]