This could be the speed of the bus on the motherbaord or it also possible that the voltage of Ram is too high or too low.
If it's a bus speed problem, you have no choice to upgrade the memory, instead you have to stick with the old one or you can opt for 512 mb since your laptop has only one Dimm slot.
First reboot your system, go into Bios Settings and go to Advanced System or Advanced or something similar option and check the Voltage settings and change the Ram voltage. You'll see the available options which is variable for the installed motherboard with the Bios. Change the Ram voltage to one point higher and reboot the machine normally. Now try playing the Video. If this doesn't help, Again change the Ram voltage to one point lower and once again reboot the system normally to check the effect.
Also update the graphics drivers to the latest version and don't forget to update/install DirectX, DirectX Version 10 will do
(click here to download DirectX 10). You can try uninstalling the Graphics drivers and reinstall it. I am not sure with this one, but sometimes this does the trick.
It's necessary to update the Codecs or install a codec pack like KLite Codec Packs
(click here to download).
Don't forget to restart the computer everytime you make the changes.
This issue is not very common and there are limited fixes. The most common problems after Upgrading a Ram are "No video" or "No Power on", but in your case, it's different and I've only come across this twice.
This is all what you can do with this for now, and if it's not worthy trying, you better stick with the old ram or 512mb (I am not sure whether you have tried with 512mb or not.)
You can check out the details about your Laptop's memory here..
click here.
Good luck.
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FixYa.
Have a great day.....