Bios setup help me please :)

hi i was just looking tru my bios and i think i could change stuff to benifit me

well before i only had the back 2 usbs but not i have 2 in the front except they dont work…
i was looking tru bios and my options for usb are
0-1 usb ports <- current setting
2-3 usb ports <- it says 2-3 on my motherboard where i hooked up the front ones…
and then all usb ports on setting

if i changed it to all usb ports on and they arnt in correct will my mb fry or blow up ?? or just not work?

next topic my graphics card in bios.
it says agp speed
0x
2x
4x
auto
currently its at auto and it only puts out 2x.
should i try 4x would that fry or blow ne thing?
also in the graphics card there is agp aperture size its currently at 64
my graphics card is 256 mb. my old one when the bios was configured had 64mb should i boost to up to 256?
also again would that fry or blow ne thing lol

my main opbjective is to not blow or fry something lol