noapic makes fans run loud

[gigaforce1111]

Hi all,
I have Dell studio 1555 laptop and I managed to make the Fn keys to work.
I did it by adding the "noapic" to the "menu.lst" file.
Since then I noticed that the fan(s) runs pretty loud.
Before that the fans was quiet on some of the times.

1. I want to ask if the mod that I did can harm my laptop?
2. Is this mod will empty my battery faster?
3. Is there a way to activate the Fn keys without changing power management?

Hope you have answers for me!

[gigaforce1111]

Hi all,
It seems today that the fans run normally.
Sorry for posting before checking for a few days.
Thank you all.