Hi all, I met this problem too, and Melanie was wrigh, it's only a problem due to the graphic card. Either the graphic card is not supporting 3D-acceleration, or your graphic drivers are not specific to your card. Cheers, Simon <div>2007/11/2, Melanie Hohberg <<a href="mailto:melanie.hohberg@tum.de">melanie.hohberg@tum.de</a>>:<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> I had the same problem when I tryed to run benchmarkPET.mac with visualition for the first time. I would recommend to check if your graphics card is supporting 3D-acceleration. I had to replace the graphics card to work with visualization. Best regards, Melanie Original Message: Dear Gate users I have a problem with visualization, I have successfully installed clhep-1.9.2.3 geant4.8.1.p02 gate3.1.1 root5.12 I use ubuntu7.04 I run the benchmarkPET, it seems everything work well . but when i run the visu.mac , the computer restart. I have tried these following steps /vis/open OGLSX /vis/viewer/reset /vis/viewer/set/viewpointThetaPhi 45 45 /vis/viewer/zoom 5 /vis/viewer/set/style surface /vis/drawVolume -> The Computer restart Any suggestions appreciated. Best regards Asma Barbouchi Faculté des Sciences de Tunis, Tunisia -- *********************************************** Melanie Hohberg Klinikum rechts der Isar Nuklearmedizinische Klinik und Poliklinik Ismaninger Str. 22 81675 München Tel: 0049 (0)89 4140 6345 Fax: 0049 (0)89 4140 4938 Email: <a href="mailto:melanie.hohberg@tum.de">melanie.hohberg@tum.de</a> *********************************************** _______________________________________________ Gate-users mailing list <a href="mailto:Gate-users@lists.healthgrid.org">Gate-users@lists.healthgrid.org</a> <a href="http://lists.healthgrid.org/mailman/listinfo/gate-users"> http://lists.healthgrid.org/mailman/listinfo/gate-users</a> </blockquote></div>