.. A lot of simple things to start with as long as you've verified the monitor is actually functioning. Although you've confirmed that the monitor was functioning correctly, have you tried swapping in a known good monitor to the tower just to make sure it's not a monitor issue?
I would still try swapping in a different video connection cable just to be sure... Open the case and if it's a standard video card, make sure the card is seated correctly by removing it, then putting back in the slot. Check to make sure any secondary power cables are connected to the card, if there are any.,,, or if it's an integrated video device, you may want to swap in a known good video card..
Hope this helps.
Hello! Has anyone else experienced this kind of trouble? It seems that the computer itself (CPU) properly powers up, and the monitor and all its attaching cables have been verified as functional, via connection with another computer.
Some history that might be relevant: the computer was manufactured 12/21/2006 and was originally outfitted with Windows Vista Home Premium. My father erased that OS and downgraded it to XP. Some time later the computer stopped sending signals to the monitor. It has been over a year now since the whole setup quit functioning.
Any clues on where to start the trouble-shooting process?
Many thanks in advance!