Thanks to anyone able to help!
This seems to be a good one, can't find mention anywhere on the 'net.
When two types of webcam software are started, webcam picture comes up briefly, then screen goes black and processor fan runs furiously.
No way of recovery has been found and computer must be shutdown with power switch.
If left too long, even power switch will not shut down and plug has to be pulled.
The two type of software are:
Logitech Webcan Software 12.10.1113.0000
Webcam is Logitech E5300
Dell Optiplex 745
Core 2 Duo 1.8ghz
2 gb DDR2 ram
Win XP Pro SP3
Soooo, yeah, just about any normal treatment has been tried.
We can isolate this computer as the problem.
This camera with the same software was tried on an identical Optiplex 745, worked fine.
A different camera on THIS computer, same problem.
E5300 software and drivers replaced.
Video Card drivers replaced
Monitor drivers installed
An extra video card was removed from the computer
BIOS video section changed from "auto detect" to "onboard".
BIOS later switched to factory defaults.
Camera was plugged into different USB slot
Flash, Java and Quicktime updated
In System > Properties > Advanced > Performance, switched to "Adjust for best performance"
Found HDD badly fragmented, defraged
Wow! After typing this up, I'm starting to think I've tried to much an dshould just reimage.
But I did want to see if anyone may have experienced this before.
Thanks for any help!!