cannot open /dev/video0 - please help

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hi there,

          i'am doing a small video application 
i have installed Logitech Quickcam Express (usb
camera) driver successfully. I could read data out of
it opening the device on one computer, but now in my 
labs i couldnt open it(i mean /dev/video0) - i have
the modules inserted 

and lsmod shows this 

[root@mitmca v4l]# lsmod
Module                  Size  Used by
mod_quickcam           30832   0  (unused)
videodev                5024   2  [mod_quickcam]
i810_audio             14480   1  (autoclean)
ac97_codec              8800   0  (autoclean)
[i810_audio]
soundcore               4464   2  (autoclean)
[i810_audio]
agpgart                23392   4  (autoclean)
autofs                 11264   1  (autoclean)
8139too                16480   1  (autoclean)
ipchains               38976   0  (unused)
usb-uhci               20720   0  (unused)
usbcore                49664   2  [mod_quickcam 
                                            usb-uhci]

mod_quickcam is the module for quickcam.

is everything in place.

Could anyone please tell me what i should be checking
for ??

or some thoughts on why such a thing happenned.


thanx in advance,
it's a bit urgent.

Cheers,
Simith

=====
/********************************************************/
"The GOOD thing about BAD things is that they END,
 the BAD thing about GOOD things is they also END"
 
 - Simith Nambiar ;-)
   mca@mit
/********************************************************/

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