Hi. Looking for help with my lexmark cs720. Suddenly unresponsive. It starts up with the lexmark logo, but then goes to a grey screen and no communication with computer. Occasionally it shows a firmware error 900.00, then reboots to the grey screen. It Seems there is a new firmware out... but I cant install without the screen working or communication with computer. Could the situation be to do with lexmark making it obsolete or anything? Any ideas would be gratefully received... I really don't want to have to throw recently changed ink as well.