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If you have another PC, use
ImgBurn or another program to burn a bootable CD (ISO) or bootable floppy (if your laptop has a floppy drive) of
MemTest86+If you don't have another PC to burn the image with, remove the newly-added RAM to get your laptop back to a stable state and create the CD or floppy disk.
(Reinstall your added RAM if you removed it earlier)
Boot your laptop with the MemTest86+ CD. Make sure the "Passes" goes to at least 2. If any errors are found they will be listed. If errors *are* found, then either your new RAM is not 100% compatible with your system, it is defective, or it is not compatible with the RAM already on your system (if your laptop has more than one slot for RAM).
Change the RAM configuration (replace the RAM, remove old RAM if your laptop has more than one RAM upgrade slot) and repeate the MemTest86+ test until you get through at least 2 passes without any errors.
Despite what people (even manufacturers) say, not all memory is created equally, and faster memory modules don't always work in place of slower ones. Likewise, you can have two memory modules that work perfectly fine in a system when they are alone, but don't work together in the same system.
