I have heard of blanking issues before.
What we need from you is more information about your hardware.
What is your motherboards make and model number?
We need more hardware information on this video card, such as the present driver and version number you are using.
Here is the latest driver available for the nVidia Quadro FX 550. This is version number 259.57 This the latest driver for Windows XP 32 Bit.http://www.nvidia.com/object/quadro-winxp-...hql-driver.html
It appears your having a driver issues here, because the problem you are having usually starts as soon as Windows loads the driver for your video processor.
Edited by MrBruce1959, 03 October 2010 - 12:42 PM.