My PC has recently started hanging completely whenever I start online video or video chat. Nothing works, even tried Ctrl+Alt+Del and mouse does not respond, leaving me only one option of hard reboot. I changed my monitor recently. Don't know whether it is the cause of the problem.
I have Windows XP SP3
1GB of RAM NVIDIA Quadro PCI-E Series videocard
Dell 1907FP monitor
CPU is 3.0GHz