So the computer screen is still black? You can't do anything? Well first thing I suggest is to make sure that the monitor is properly plugged in to the power source, both on the outlet and the monitor. Check to make sure that the monitor is securely attached to the computer. Turn the monitor on.
Sorry if I am going through what seems to be painfully obvious steps, I once drove 1/2 hr to a clients to 'fix' their 'broken' computer and all I had to do was turn the monitor on!
If your monitor doesn't work after all of this, either the monitor has died, or the video card had died. Can you test the monitor on another computer? Can you test another monitor on the computer in question? If you can you'll get a better idea where the problem lies.
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