Hi, I have a 3 year old Dell Dimension E521 which has given me no problems whatsoever. During a boot up 2 days ago, there is suddenly no signal from the tower to a 1.5 year old flat screen monitor which I have confirmed to work on another computer. The Dell has not been moved and appears to run through start up without any problems. I have blown all of the dust from the interior and double checked the connnection which are secure. I have tried the hold the power button for 60 seconds "trick" to no avail and have also checked the cable as well. Any other ideas? Many thanks.