Fixed. I had posted a reply saying I also had a third monitor using DisplayLink that would not come on for ten mins after Windows 7 startup. However after a disasterous attempt to diagnose the ATI driver (do NOT install the Driver Verification Tool!), I reinstalled the Graphics card driver, and on reboot my screen appeared. So it was my ATI Mobility Radeon HD 5470 Driver at fault. The driver is unchanged at version 8.680.0.0 18/11/2009
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