I'm having quite an issue here. When watching videos on the iGPU the picture is fine but the movements are in blocks when in full screen. Juste a little annoying for a brand new system. I bought a discrete GPU, I have the exact same problem. I swap that card with a friend, my card works fine in his system, his card is worst in mine. I went out and buy a brand new and more powerful power supply... same problem.
Both cards work on other system after tests. The onboard is a Geforce 6150se nforce 430. The first discrete I bought was a GT220 and the other one is a Radeon HD 3650. Both with 512mb DDR2.
The problem is with both Windows XP and Ubuntu 11.04, 10.10.
The last thing I want to do is send back the motherboard for RMA. I'm in the east and have to ship it back to the west. Is there perhaps BIOS settings I should check?