FC6 on a HP DC7700

[Gianluca Sforna]

Hi all,
I just put my hands on a shiny HP DC7700, a Core 2 Duo based PC, but I
can't boot the installer because it hangs right after detecting
keyboard and mouse (PS/2)

Does anyone experienced similar issues?

googling around I already find some (scary...) info, and tried w/o
luck booting with acpi=off (boot, but it seems like hanging on every
screen, then eventually go on with the next after some minutes!),
noapic and nolapic.

any help appreciated

Cheers

Gianluca