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No signal at the monitor indicates (if you know the monitor is working ok) a failure of the graphics chip or graphics card, The lack of indicator light on the num lock LED and the lack of power to the mouse would indicate that there is a major issue with the motherboard. you can try using another monitor to confirm the problem lies with the graphics, and in the case of the keyboard and mouse, swap them for a usb version, if they work, the Ps2 ports are probably damaged. I'd be thinking of replacing the motherboard
Does the keyboard light up and if it is an optical mouse then do u see any light under the mouse? If not then try any other keyboard and mouse. If they do not work either try this. Unplug all the cables from the back of the pc. make sure not a single cable(power cable too) is connected on the back of the pc. then press the power button and hold it for 30 seconds. Then reconnect only the power,monitor,keyboard and mouse and check if they are working or not. If fails. then most likely the motherboard has gone bad.
If there is no display on the monitor, then your computer is not sending a video signal to the monitor. This could be caused by a bad video card or some other hardware problem. I would open the case and disconnect all the devices (hard drive, CD, etc. Leave only the CPU, memory, and video connected. You could leave the keyboard and mouse connected too. If your computer then starts, you can start to add devices (after turning the computer off) one at a time. If this doesn't work, then you are looking at replacing the motherboard or just the video card if that is possible.
no there is nothing wrong with the motherboard, please shut it down, disconnect all the connectors, leave it for 10 or 15 min then connect only keyboard mouse and power and monitor cable, and switch it on, see what u get. let me know ok? i am waiting for ur reply :-)