Overclocking nForce 2 and 3 Start Black Screen and CMOS clear

It was tried to overclock, the computer does do nothing more, does not start.
With PC start is to be seen only " black screen " on which nothing does itself. 

The named problem can be found if hardware about the limit is overclocked, or a
invalid BIOS setting for the Mainboard is selected. 

Here only a biology reset, also named remains CMOS clear will help 

How a CMOS clear works, one finds, e.g., in the Mainboard manual for the 
respective mainboard. 
The mainboard manual is useful because there the CMOS Clear function is 
described and is shown where the jumper for it is. 

If a Mainboard is not a manual to the hand, below a general BIOS CMOS clear
manual, whow to do.


Open PC housing side wall. Search a jumper near the BIOS battery lies, or if existing,
in the Mainboard manual is described the exact position of that jumper.

This jumper, same find like with a hard disk, is set throw to an other position. 

Forward as follows: 
1.) Behind in the PC switch off power supply, if no power switch is existing, please
plug of the electricity supply. [power off]
2.) Pull electricity power supply ATX connector of  to the Mainboard, the plug 
connactor is usualy white on the Mainboard, narrow, rectangular.  
3.) Move the located jumper, so from 3 PINs now the PIN is covered before was free.
(This is the jumper position CMOS clear) 
4.) Approx. 10 seconds wait 
5.) Set the moved jumper again back on the original position.  
6.) Plug the white Power supply connetor on the mainmaord again. [connect] 
7.) Power supply switch back in normal position. [power on] 
If no power switch is existing, please plug on the electricity supply.
8.) PC new start and adapt BIOS on needs. As for example date and time.
Store changes.
* FINISH *  

BIOS battery is a matter also taking with current disconnection. However, 
is more unreliable. Often one must wait long to all residual voltage is diminished.

If to high overclocking the reason was for black screen, one should concern it
afterwards a little less agressiv. 

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