Black screen after installation of a command-line version of ubuntu 12.04

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http://askubuntu.com – I just installed ubuntu 12.04 on an old machine (athlon 1,2 GHz, 1GB RAM, [SiS] 65x/M650/740 graphics). When I boot the screen turns black after the BIOS messages. Even grub doesn't appear. The system reboots if I press Ctrl+Alt+Del. Ctrl+Alt+F2... doesn't bring my to any tty. However I can access the machine via ssh (I installed it in expert mode and selected open-ssh-server during installation). Any ideas how to fix this? (HowTos)