Ubuntu 7.10 beta failed to reboot after successful installation on Acer Aspire 5520 G

First of all, I couldn't install Ubuntu 7.04 (neither i386 nor amd 64) "official release" on my new notebook (Acer Aspire 5520 G), thus I tried to install the beta version of Ubuntu 7.10 i386 (the amd 64 version doesn't work at all). The live cd was loaded very slowly but I finally managed to install Ubuntu successfully. I was asked to reboot the system and remove the live cd. I did as I was told but Ubuntu failed to start. The following error message appeared on the screen:
"Busy Box V1.1.3 (Debian 1:1.1.3-5 Ubuntu 4) Built-in Shell (ash)
Enter 'help' for a list of built-in commands.
/bin/sh: can't access tty; job control turned off (initramfs)"

I suspect that it's a hardware compatibility issue i.e PCI bug. I have noticed a PCI error message while the machine was booting but I couldn't write it down; the message appeared and vanished within a second!

I'll provide you with the following hardware information:
Acer Aspire 5520 G
AMD Turion 64 Mobile Technology MK-38 (2.2 GHz, 512 KB L2 cache)
Up to 384 MB Nvidia Ge Force 8400M G Turbo Cache
1 GB DDR2
15.4 WXGA Acer Crystal Brite LCD (8ms 1220 nits)
120 GB HDD
DVD-Super Multi double layer
802.11 b/g WLAN

I hope that developers will be able to sort out this hardware compatibility and software installation issues. I truly wish I could run Ubuntu 7.10 on my new acer notebook.

Thanks for your co-operation.