# Graphic card

**URL:** <https://psychtoolbox.discourse.group/t/graphic-card/1205>\
**Category:** Uncategorized\
**Created:** [February 17, 2009, 2:23pm UTC](https://psychtoolbox.discourse.group/t/graphic-card/1205 "2009-02-17T14:23:53Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\
**Post date:** [February 17, 2009, 2:23pm UTC](https://psychtoolbox.discourse.group/t/graphic-card/1205/1 "2009-02-17T14:23:53Z")

</div>

Dear colleagues,

&nbsp;

I am using a NVidia Quadro4 XGL for 2 monitors. I have downloaded the Psychtoolbox 3 and I am experiencing sever difficulties to make it run. Most of the errors are related to OpenGl like "OpenGL error after flip: invalid enumerant". There are problems also with shaders and with synchronization. I have downloaded the recent drivers (at the beginning I could not even uses Screen(1,'OpenWindow',0);). The computer I am using is Dell Workstation PWS 650, Xeon CPU 2.8 GHz, running under Windows XP. I am using Matlab 7.01.

&nbsp;

&nbsp;

I will greatly appreciate your help.

&nbsp;

Sincerely,

&nbsp;

Nadejda Bocheva

Institute of Neurobiology

Bulgarian Academy of Sciences

Acad. G. Bonchev str. bl. 23

Sofia 1113

Bulgaria

&nbsp;

&nbsp;