Installation hangs during boot on new computer

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http://askubuntu.com – I wanted to install Ubuntu 11.10 on my new PC. But LiveUSB hangs on boot (stops at line x initrd memory freed; if I press enter it writes some more lines and hangs again, this time completely). Tried also LiveCD, Ubuntu 12.04 alpha, Fedora 15, Rescatux (Debian), noapic, nolapic, safe mode and everything won't boot. Currently I'm forced to use Windows7. My config: Processor AMD FX(tm)-4100 Quad-Core RAM 8,00 GB Graphic Gigabyte GV-N56GOC-1GI (NVIDIA GeForce GTX 560) Mainboard Gigabyte GA-870A-USB3 Network cards: Compact Wireless-G USB Realtek PCIe GBE Family Controller (HowTos)