Under normal circumstances, a computer monitor will not remain powered up if it is not receiving a signal from the cpu. Whether or not this is the problem in your case is difficult to say. First steps would be to check all the cable connections to the monitor and cpu, and if that doesn't solve the problem, try another monitor with your cpu to see if it truly is your monitor that is bad or if what you describe is just a symptom of a larger problem. Good luck!
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I guessing that when you say "goes off" you mean it goes into power-saving mode?
Assuming that you're working on the computer at the time (so it's not actually going to power saving mode from inactivity), this might indicate one of two things:
a) the VGA cable to the computer is not in a good contact with the monitor. This might happen if you haven't used the screws to fix it in place, just try to plug it fully in on both ends (computer and monitor). If the monitor sees to VGA signal, it goes into power saving mode automatically.
b) there's a problem with the monitor that builds up after a few minutes. When you turn it off, it "cools down" and can be used again. If that's the case, you should take it to a dealer's shop and have it checked (or replaced if it's still under warranty).
I switch on my PC, ensuring that all cables, leads
and power supplies are connected properly. The tower powers up no
problems at all. I switch the screen on, the green led lights up, the
screen is completely black. A blue box appears centrally on the screen
with the text 'power saving mode'. The green led light turns amber and
then the screen just goes black.
Please don't suggest going to control panel, as I can't get that far.
It basically goes to Power Save Mode. Check for the same error in System Setup screen, if the Monitor goes off in System Setup then you better need a replacement. Else you would need to reseat the Video Card(If any) and the Memory Modules. Please keep posting for any further issues / improvements.
Your monitor is going into power saving mode. When it receives no video signal from the computer, it will stay powered for a few seconds before giving up and presuming the PC is off hence why it stays green for a while, then goes orange.