I installed both the 32 bit and 64 bit versions of Ubuntu 10.04 Beta 2. After install, where automatically login, or request password was chosen the Ubuntu chimes sound and then the screen goes black. The chimes repeat every second or two, with the screen remaining blank. The system is completely non-responsive and the Num Lock, Caps Lock and Scroll lock lights flash on and off repeatedly on the keyboard. I am running Ubuntu on a Intel Core 2 Q6600, with 8Gb of RAM, A DFI Lanparty motherboard, Two ATI Radeon 4850's installed as crossfire. As is I cannot use 10.04 as both versions do this. I am reporting this bug from Windows. If there is more information needed please advise, I'm new to reporting bugs.