adding memory causing problems

[judd]

I installed 2 ddm2 PNY memory sticks of 1gb each into my Toshiba Satellite. The computer crashed constantly, fading to death via the BSOD  then sometimes requiring a system restore other times starting back up fine.

Does anyone have an idea what caused that to crash my laptop ? I would like to install one of the memory sticks (or both) into my Compaq C700, but maybe I should leave well enough alone.

[drmsucks]

Assume that you mean DDR2...

Without regard for the Compaq for the moment, does the Toshiba: a) support DDR2?, b) support 1GB modules in each slot?, c) support the type of memory that you installed - voltage, buffered/unbuffered, etc?

[dahlarbear]

I would start by verifying the memory is the correct type, size, density, and speed for your system.  Also ensure you're not exceeding the total memory your system supports.  Check your system documentation (look for it on manufacturer's website) or the "Crucial Memory Advisor™ tool" on the Crucial website.

I would then reseat and test the memory.  Install one memory module only and test it.  Then replace it with the other memory module and test it.  Then test both together.  If you get errors, you might try the module in the other memory socket (in the unlikely event the socket has a problem).  You need to observe Electro Static Discharge (ESD) precautions when handling electronic components (like memory modules).

MemTest86 is a standalone program on a bootable floppy or CD that will rigorously test your memory.  It will run until you manually stop it (or the program crashes - not normal behavior).  Let it run for several complete passes.  You shouldn't have errors. 

See MemTest86.  Follow the "Free Download" link (left hand side of web page) to either the floppy:
    Download - Pre-Compiled Memtest86 v3.4a installable from Windows and DOS

or CD versions:
    Download - Memtest86 v3.4a ISO image (zip)

The "Technical Info" link (left hand side of web page) is the documentation for the program.