How do you have the monitor conneted to your System Unit?, some PC's require a special port for flat screen monitors. Please post what PC you have and what type of monitor also, then i can give you more information.
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I would think it is either you motherboard or your power supply. I would start by looking at the power supply. You can pick up a tester at any electronics store. Even at that most of the time electronic stores will test the power supply for free. If it isn't that then I would check out the mother board.
When you say computer clock do you mean the LED read out on the mother board? if so the numbers you are seeing are error codes you will need the mother board manual to know what those codes mean. If you don't have the manual it's possible you can go to the mother board manufacturers web site and download one then you can look up the codes to see what the problems are. Hope this helps
You can try tighten up the cable behind the monitor or disconnect the cables and reconnect. You can try another monitor to see whether the mother board and the cable works. Some settings in BIOS may be changed to use on-board video card (the one embeded on the mother board, which is connected on the ports out of the card slots) on your computer so make sure it is using the graphic card that is connected to the monitor. For keyboard, if may be mechanic issue on port or keys or cables if you will not see anything wrong about the keyboard. You can try to use another USB port if it is an USB keyboard or use a USB/PS2 converter if the PS2 keyboard port is not working. If it is a PS2 keyboard, you can check whether the pins are bent and reconnect it. Sometimes that helps. If it is a wireless keyboard, then you will need to fix the monitor and then maybe fix the driver and stuff. You can remove all objects beneath the keys by putting it upside down and shake it or use a blower.
It looks like issue with either mother board or processor.
open the box and remove all memey and power it on.
if it makes a beep sound, there is no issue with processor,
else we suscpect processor.
If it make beep sound, it might be mother board issue.
And for checking monitor working condition, remove monitor data cable and see no cable connected messages comes in monitor or not
first be sure that the monitor is working (plug into another computer or laptop).
on you have that try to get a video card, it might solve you problem, if not change the mother board
have a good christmas
most of such cases are not due to problem in monitors... they are problems caused by mother board's or the externally attached graphics/video cards... So in order to make sure which causes problem.. you can try to connect another monitor to your system.. or perhaps your monitor to another system...
If the monitor is faulty colored everywhere.. then the monitor has to be given for repair.. (you cant do it by yourself)
if the other way... any monitor connected to your sys is faultly solored.. then you have to change your video card attached to mother board...
THere are two possibilities
1. problem in mother board
2. problem in monitor
To make sure if possible connect your CPU to another monitor and see if all is fine. If the other monitor works fine, then your monitor has th problem
if the other monitor also has lines, then the mother board's video card has prob.
Also check the connection wire between the CPU and monitor that there is no loose contact or any cuts or damages in the wire