|I can boot into Safe mode, where I now am. Known problem, or defective device?|
If it was a hardware issue you would not be able to start Windows in safe mode either.
Your symptom (Windows only starts in safe mode) typically occurs when a bad or incompatible third-party driver is installed.
If the problem started after installing your new graphics card driver, that must be the driver that's bad or incompatible, or it's conflicting with some other driver.
The supplied drivers on the CD will be out of date by now so you might want to try installing the newest driver for that card model from Sapphire's website: http://www.sapphiretech.com/present...