System booting is not shown on monitor and keyword is not working but processor is running. How can i resolve it? Power of monitor is ok.

Please be a bit more specific!

1)Does the computer screen show anything? at any time during Boot?

2)Did you hear windows default music start as to how you know system actually started?

3) does the monitor light turn on then turn off or changes color during the boot proccess?

4) make and model of computer?

5) just because you can hear the fan turning doesn't mean the proccessor is working...and which fan(s) are you hearing?

6) what do you mean keyword does not work? Do you mean Keyboard?