I am installing UEC 11.04 on two mini mac machines to create private cloud. These machines are dual boot with OS X and UEC. Booting with OS X works fine, but boot with UEC giving few problems mainly on monitor display. The screen becomes shaky and sometime with few white lines. The machines have 2GB RAM as minimum requirement to install UEC. Is this display problem due to RAM or anything else? Have anybody come across this issue?
Is there any recommended link I can refer to start all over again from beginning?

Please help.