PC hardware forum: Hardware problems-RAM and motherboard

are all of your ram sticks the same voltage/speed/timings?

boot into your bios with 2 sticks and manually configure the ram to run at ddr2-667 (or use fail-safe settings). save those settings and shutdown the pc. install the additional 2 sticks and try to boot.

if it boots fine, then manually set the timings for ddr2-800 at cl 5-5-5-18 and try again.

if it still only boots with 2 sticks at ddr2-667, then you probably have a compatibility issue and would need to replace the other two sticks.

give us the precise info mfg., series and model number.

Intel motherboards have been known to be sensitive to RAM voltage and MBs in general can be sensitive to running 4 DIMMs (4@1-4GB) vs 2DIMMs (2@2GB).

VAPCMD

will *any* combination of sticks work as a pair or is it only a certain combination of sticks that work as a pair? did you set the memory timings to ddr2-667 and try all 4?

Now that you used that to get items such as "module voltage-SSTL 1.8V" did you check the maker's web site to see if that matched then head to the BIOS to see if you set the BIOS to match?

Build your own PCs have taken a turn to more complexity as I find build after build with incorrect BIOS settings. People seem to think this is automagic.
Bob

it is DG35EC.i'm sorry.i've confirmed this.i've went to bios and changed from 800Mhz to 667 and 553.but after i turn off my pc and add the other ram,it did not boot up.i almost want to giving up and just buy another 2GB ram,but i'm afraid it will not compatible with the other 2 ram of 1GB.

i'm really sorry.but i'm not used to some of detail about hardware.what is dimms actually?