problems with ubuntu 9.04

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http://www.ubuntux.org – I've recently installed ubuntu 9.04 (32-bit) on my HP 6715b computer with AMD Turion x64. The first problem are white lines that flash on my screen every time I open a program, move a window along the screen or without any reason at all. The second problem is that my computer won't start up or shut down without me pressing space or mouse button from time to time. I tried installing ubuntu 9.04 64x, but it worked even worse. Please help! (Distributions)