Installing ram macbook pro - Apple MacBook Pro MB991LL/A 13.3-Inch Laptop Notebook

Did you try searching before asking? MacBook Pro 13 Unibody Early 2011 Battery Replacement

If you have a apple store account and wifi, you hold down the Option and the R buttons while booting until the apple symbol appears, follow menu from there to install proper OS

You have a bad driver. Reinstall your screen driver or clear your P ram by holding the letters P and R and the control button when you boot your laptop. Hold them until it chimes and reboots.

It's a good product but has it's limitation in terms of no CD/DVD drive, lack of USB ports, quite a small hard drive (80 GB as opposed to 500GB for a low end Macbook Pro), less RAM and smaller screen (11.3 inch as opposed to 13 inch for a Macbook Pro). For another 200 dollars you could buy a macbook pro which has higher specs.

Hello thx5,
It depends on how the 2GB in your T400 is currently configured. If the 2GB in there now is just one 2GB stick of RAM then yes you can add the other 1GB stick and then you will have 3GB of RAM installed. If your 2GB is two 1GB sticks of RAM (which is more likely to be the case) then the 1GB stick you have from your Macbook Pro isn't going to help.

Note: your laptop can handle up to 8GB of RAM via two 4GB sticks.

Hope this helps, if so please leave some good feedback. Thanks.

4GB is the MAX but only 3GB is utilized.
What Os are you running. Tiger Leopard Snow Leopard?

Hello, this certainly has to deal with your RAM memory. have you installed RAM recently? if not, you can try memtest to test your memory, or take our 1 memory after another, Hope this helps

You can search google... it works. http://lifehacker.com/software/ram/hack-attack-how-to-install-ram-in-your-mac-and-save-big--198396.php