Computer wont start up after installing 1gb ddr 400 memory

[termister2000]

Hi,
Finally ive got my new memory. 1gb ddr 400 mhz CL3 memory slot. Im using a sony vaio RS720G computer. I have 4 slots in my MOBO. 256,512,256,empty.
Today I tried to put in my new memory. after installing the memory i swiched on my computer. The computer ran fine till the VAIO and the INTEL PENTIUM 4 pics were shown. Then when the windows should load up the computer restarted him self and put me into the safemode message. I chose the safemodde. I saw some drivers booting but then the computer again did restart..... i put out the new memory and the pc booted fine. MAybe the 1gb stick wont work with 256mb stick??? Any sujestions?????

Thank you.

[Yellowbeard]

Try the 1gb stick by itself. Also, just to be clear, are you trying to mix the 1gb stick with 3 others?

[termister2000]

Thanks for reply.
Im trying to put this(1gb) memory with 512mb stick and 2*256mb sticks.
Is it not ok??????

[Yellowbeard]

No, you are most likely not going to get that combination of memory running, I am actually surprised to see that the 2 x 256mb ran combined with the 512mb. Your system is configured to run the memory in dual channel. You should add the memory in pairs of EXACTLY matched sticks. I would suggest that you get a 2nd stick of the 1gb that is EXACTLY the same as the first. Use those 2 in the slots that your 2 x 256mb originally came in. You can try adding the 2 x 256mb to the 2 x 1gb in the other 2 slots but it may not be stable.