Dell precision 650 workstation 1Gb ram trouble

[cmfugen]

hi

I have a Dell precision 650 workstation with 2x256 MB ram of pc3200u of 400 MHz.When i tried to insert more ram of 2X1GB of same Pc3200u of 400 MHz, the memory is getting recognized in the properties of my computer but at the start it is showing memory line failure and after getting boot it is getting crashed. This happened when i did along with the old ram, when i tookout the old ram and put only new ram of 2x1GB (2 sticks) then it is not getting boot in to operating system. I am using Win XP SP2. Can any body suggest something to avoid the problem.I tried to check the hardware with the bell arc and it is showing the ram i have is 2x256MB and i can go upto 4 GB. Please help me!
thanks

 

[brinks]

Test the memory with memtest and see if there is any errors with it.

 

[cmfugen]

sorry, i am not able to do that as i already told that when ever i load the ram and got started then it is getting crashed and without those new rams i checked memtest86 i dont find any problems