I have an Acer Aspire 5600 laptop. It's graphic card is ATI Mobility Radeon X1300 (HyperMemory). There are two problems: 1)I have a lot of difficulties with graphics. For example "Compiz" can not work properly on my laptop.(No 3D effects) 2)when I restart the pc, it takes a very long time boot. (almost 2 minutes)It shows a black screen for several minutes.

I would also like to know that if I install KDE instead of Gnome the problems will be resolved or not.