Lenny overheating, preventing installation

[Klistvud <quotations@aliceadsl.fr>]

Starting the new 5.00 Lenny DVD and selecting (any type of) install, some 5 to 
10 minutes into the installation process, my laptop overheats and shuts down. 
It's a HP Compaq 6715b with an AMD Turion 64 and an ATI Radeon 1200. Needless 
to say, I have the BIOS option "Fan always ON when on AC power" set to 
enabled, but to no avail. Same happens if I set the option to off. Is there 
ANY way to install Lenny on such laptops? Does it happen with other laptops 
too?

Any viable suggestions welcome!