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Memtest works fine, but "Try Ubuntu", "Install Ubuntu", and "Check Disk For Defects" go to a blank screen with a blinking cursor.

I'm using the 64bit installer because that is what, I think, works with AMD processors.

Hardware: AMD Sempron, Award Bios and a Gigabyte video card

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check this… – jet Jun 5 '12 at 19:50

The choice of installer selected by you is fine since AMD Sempron is a 64 bit processor.

But, the the installation is not going beyond the initial black screen may be because your system is not having the basic requirements for 12.04 satisfied I hope.

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