Is it safe?

This is more related to the PS2 in general, but I've found help on this forum before so I'll try again.

is it safe (after having magic switch installed on the PS2) to play your games with the lid open?
I ask because, due to the magic switch install, my console makes alot of noise when the is game loads and such from the consoles lid (slimline, btw).

Thanks.

-=Kross