I've got a Dell Dimension 8400 and a 2001FP monitor. When i boot the computer up, the video card's fan is spinning and the computer seems to power on fine... except for the fact that there is no image on the monitor.
The monitor itself acts as though it is connected to the computer while the computer is off. The light on the monitor normally remains yellow while the DVI cable is connected to the computer but the monitor is not powered on; because the yellow light is on, I assume that it is not the cable.
The computer seems to get into Windows because you have to hold the power button down to turn it off, which means that something is happening. However, I have a Logitech G15 and, while it is getting power, which I can tell because the num lock light is on, is nonresponsive. The LCD on the monitor doesn't work and the lock keys don't do anything.
Any ideas what the problem could be?
Holding in the power button on the tower would work whether it was in Windows or not - although if it didn't work at all then that would point to a definite problem.
The yellow standby light means that - assuming the monitor is OK - it is not receiving a video signal from the computer. Does the monitor display "No Signal" if you disconnect it and turn it off and back on again?
The big question is: is it POSTing?
Did it used to make a beep when you turned it on? Is it doing that now?
If you disconnect everything from the machine and let it stand for a few minutes, then plug in just the mains cord and turn it on, what happens?
Fine, lights will probably come on (so the PSU isn't dead), but what else happens? Does the HDD light flicker for a minute or two as Windows loads?
If it does, how do you normally log in? Using TAB and the arrow keys (obviously having turned off and reconnected the keyboard and mouse) you can switch between user log ins and type 'blind' (you have to guess a little, but if you know your computer you can do it). If this succeeds you may hear the Windows sounds (plug speakers in, of course).
If it isn't POSTing then there is a problem.
I think it's the motherboard. I have the same problem
It is not the monitor that is the problem in my case. I have tried with several. But a black monitor can come from many problems, you just have to replace all components in your PC, one component at the time, til you find what is causing the problem. For example, try the RAM-sticks one by one (if you have two or more), try replacing the graphics card, etc.
