I have an Intel D945GCNL Motherboard with 3.0GHz Processor and 512, DDR2 RAM. it does not boot wheres RAM beef is ok when RAM is not installed in MB. I checked with other good RAM those are behave same. Please send me the solution. If need to change any chip in MB I can do it.

No. The maximum that your motherboard will support is 2 GBs of RAM. 1 GB on each slot. Refer to this link: http://www.crucial.com/store/listparts.aspx?model=D945GCNL

The Intel D102GGC2 uses a Dual Channel Memory Architecture meaning that both slots need to be running at the same speeds. I would suggest getting another 667 MHz RAM card and installing it along side your current one, just as I reminder this motherboard only supports 2GB RAM Max so don't get one that is above 1GB.

Yes. Up to 2GB officially, 4GB unofficially.

I found the manual on the net that gives you instructions on replacing components if you're not sure how, it can be found here.

RAM upgrade
The Compaq Presario C700 uses DDR2 Laptop RAM as shown below.
The motherboard of the Presario C700 has two RAM slots, one of them will be occupied by the 512MB RAM (running at 667MHz) module you have at present. This leaves one more that can accomodate a DDR2 667Mhz card of up to 1GB or you could get two 1GB DDR2 800MHz (the faster DDR2) cards and remove the 512 leaving you with a wopping 4GB of memory, that'll definately speed it up. Just remember the Presario C700 can only have up to 2GB of RAM so don't go higher than that or Windows will not boot for some reason.

Processor upgrade
The Presario C700 supports any Socket P, Core 2 Duo or Pentiun Dual Core chips. The fastest processor you can get is the Intel T8300 2.4GHz Core 2 Duo Processor with 3MB L2 cache and an 800MHz FSB

For a full list of compatible processors go to page 9 of the user manual found here.

667 DDR2 SDRAM DIMMs is fully suited for Intel D102GGC2 motherboard.

Your board can not run DDR2 memory. See page 13 in your manual. Open the link provided by Intel for your MB D101GGC.
Up to 2.0 GB utilizing 512 Mb or 1 Gb technology
http://downloadcenter.intel.com/SearchResult.aspx?lang=eng

Cheers'
Mike

That can be taken by The onboard graphics card. please have a look on oi on your bios menu.

564 mhz means it is a Pentium 3 or equivalent. This also means that the motherboard does not support DDR2 RAM which is exclusively for Socket 775 and Pentium 4 chipsets. Pentium 3 usually support SD-RAM, also but very rarely DDR1 RAM. Sorry but DDR2 will not work in your PC.

go here
http://www.intel.com/support/motherboards/desktop/D945GCNL/

here are the specifications of *********** board go through it...
Processor Support Intel® Pentium® 4 processor, Intel® Celeron® D processor and Intel® Celeron® processor in the 478-pin package
Note: It is important to verify supported processors before using this Intel® desktop board. Supported front side bus speed 800, 533, and 400 MHz Integrated Graphics Intel® 865G Chipset with Intel® Extreme Graphics 2 Chipset Intel® 865G Chipset AGP Connector AGP 3.0 (4X & 8X Speed 1.5 and 0.8 Volt Only) Memory Type Dual Channel DDR 400 MHz (PC3200), 333 MHz (PC2700), and 266 MHz (PC2100).
Note: Be sure to review important memory and system bus speed considerations before using this Intel® Desktop Board Max Memory Capacity of up to 4 GB Memory Slots 4 DDR DIMM Sockets Slots 6 PCI
So it will support DDR2 and you can upgrade upto 4GB...