|"i overclocked cpu and it doesnt run and my monitor shows no signal cable"|
You apparently don't know how to properly overclock & overclocked the system WAY higher than it's capable of running it - now it's unbootable. You need to unplug the power cord, open the case, then reset the BIOS either by using the "clear CMOS" jumper or by removing the battery for a few seconds. This will reset the BIOS settings to the defaults & also reset the date/time. You will have to enter the BIOS on the next reboot & correct everything.
If you have questions about overclocking, post in the "CPU/overclocking" forum.