eBay is probably the cheapest but NewEgg is more reliable. E.g. this should work
will I see an improvement? I think it's kind of weird to spend 100$ for like a 3 year old laptop almost..
Yes, an upgrade from 2GB to 4GB will be noticeable. That machine should easily last you another three years with a simple RAM upgrade. It's a lot cheaper than buying a new 2000$ MBP
I will be a new computer before 3 years, especially when the screen has white patches and that the dvd-rom doesn't work anymore...
when the pinwheel is spinning, could it be hard drive too?
With pinwheels and 500MB free, I think you should start backing up your data is you aren't already; pinwheels are often a sign of a failing HDD.
I will be a new computer before 3 years, especially when the screen has white patches and that the dvd-rom doesn't work anymore...
when the pinwheel is spinning, could it be hard drive too?
...or low disk space, or a bad user profile, or a multitude of other things.