I have a 4 year old Dell Dimension 8100 PC that is refusing to boot. When I turn it on I hear intermittent clicking noises, then after a little bit, I get a message something like "F1 to retry or F2 for Setup". I checked the LEDs on the back and they flash randomly before settling on A, B, and C green and D yellow. I found a website that defined the codes, but this code is "Other no Port/video". I'm not sure what it's telling me...Is it saying I have a bad video card or something else? I would appreciate any help you can give with this.