New System Problem

[Young]

I just built a new system and installed Ubuntu 8.04.01-alternate-amd64.

The system boots into a fractured graphics image with the Ubuntu logo 
repeating 5 times across the screen. Each repeat is just horizontal 
lines like a bad version of the AT&T globe logo. There's also a lot of 
garbage on the screen, and no evidence of a cursor pointer.

The 8.04.1-desktop-amd64 suffers the same problem.

The install ran fine & the 8.04-desktop-i386 runs in live mode without a 
problem.

Memory tests ran without a problem for over 75 minutes, but with 4GB I 
wasn't going to wait for it to finish.

	Intel Pentium Dual Core E2200 Allendale 2.2GHz 1MB L2 Cache

	ECS GF7100PVT-M
	North Bridge  	NVIDIA GeForce 7100
	South Bridge 	nForce 630i
	http://www.newegg.com/Product/Product.aspx?Item=N82E16813135066

Any help would be appreciated.

Mark