When the PC is switched on the monitor goes almost immediately into power save and therefore I can't see anything. This is before the operating system runs up (XP). Hitting any key or pressing the mouse button does not bring it back out of power save.
As I can't see anything on screen, I can't check anything.
Sounds like the pc is not booting or the video card is not starting. Does it give the post beep as normal? Does the hdd light carry on flickering as if the os is installing? Check all the connections, pop the case open & check the graphics card is seated properly.
When you say replaced graphics card do you mean reseated the original or a different card? Does the card have any other out puts s-video or tv? Do you think the machine is running and only the display is blank? Are all the fans switching on the cpu, graphics card ect?
get your torch look for a tiny bulb on the motherboard,does it light up when you press the power button? ( not all M /B have this bulb ) if it does light, it could be a piece of faulty hardware, graphics card, memory,sound card , modem take them all out, disconect all drives,leave only the processor, press power button, if it powers up, put one thing back at a time,till it wont power up, if it does not power up with everything removed you could have a failed processor, i say this as i have had the same result as you when i tested a processor,dead computer, i put back the old processor computer is fine all this of coarce after you have tried another monitor and its cable
This thread is now locked and can not be replied to.