After reading a topic on your site I have obtained a Crash Dump Analysis from WhoCrashed which is pasted below.
By way of background, a while back we were getting no display on the monitor so we tried moving the monitor connection to the onboard grapics slot and this seemed to work... so from this we deduced that there was a problem with our graphics card. Then My nephew replaced the graphics card with an old one of his. Judging by the info in the crash dump analysis maybe this is what caused the BSOD.
I tried the google search for driver updates mentioned in the conclusion but this is where I got stuck - I'm not really sure what to look for - are you able to help me with this?
I saw in an older post you helped someone with a similar prob so am very hopeful! Many thanks
System Information
computer name: D8QB583J
windows version: Windows XP Service Pack 3, 5.1, build: 2600
windows dir: C:\WINDOWS
CPU: GenuineIntel Intel® Core2 Duo CPU E4400 @ 2.00GHz Intel586, level: 6
2 logical processors, active mask: 3
RAM: 2145492992 total
VM: 2147352576, free: 2045931520
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Crash Dump Analysis
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Crash dump directory: C:\WINDOWS\Minidump
Crash dumps are enabled on your computer.
On Tue 6/28/2011 9:10:43 PM GMT your computer crashed
crash dump file: C:\WINDOWS\Minidump\Mini062811-01.dmp
This was probably caused by the following module: nv4_disp.dll (nv4_disp+0x2446BE)
Bugcheck code: 0x1000008E (0xFFFFFFFFE0000001, 0xFFFFFFFFB83F0925, 0xFFFFFFFFAF5C2704, 0x0)
Error: KERNEL_MODE_EXCEPTION_NOT_HANDLED_M
file path: C:\WINDOWS\system32\nv4_disp.dll
product: NVIDIA Compatible Windows 2000 Display driver, Version 270.61
company: NVIDIA Corporation
description: NVIDIA Compatible Windows 2000 Display driver, Version 270.61
Bug check description: This indicates that a kernel-mode program generated an exception which the error handler did not catch.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
A third party driver was identified as the probable root cause of this system error. It is suggested you look for an update for the following driver: nv4_disp.dll (NVIDIA Compatible Windows 2000 Display driver, Version 270.61 , NVIDIA Corporation).
Google query: nv4_disp.dll NVIDIA Corporation KERNEL_MODE_EXCEPTION_NOT_HANDLED_M
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Conclusion
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1 crash dumps have been found and analyzed. A third party driver has been identified to be causing system crashes on your computer. It is strongly suggested that you check for updates for these drivers on their company websites. Click on the links below to search with Google for updates for these drivers:
nv4_disp.dll (NVIDIA Compatible Windows 2000 Display driver, Version 270.61 , NVIDIA Corporation)
If no updates for these drivers are available, try searching with Google on the names of these drivers in combination the errors that have been reported for these drivers and include the brand and model name of your computer as well in the query. This often yields interesting results from discussions from users who have been experiencing similar problems.
Read the topic general suggestions for troubleshooting system crashes for more information.
Note that it's not always possible to state with certainty whether a reported driver is actually responsible for crashing your system or that the root cause is in another module. Nonetheless it's suggested you look for updates for the products that these drivers belong to and regularly visit Windows update or enable automatic updates for Windows. In case a piece of malfunctioning hardware is causing trouble, a search with Google on the bug check errors together with the model name and brand of your computer may help you investigate this further.