cant boot my pc

[dslilbit7]

my dell computer is trying to boot from the cd rom but i dont have a boot disc therefore it wont boot up so im unable to enter bios to change the boot order is there a way around this

 

[CrazyDingo]

What model?
With dells you can usually hit a key (sometimes f2 or f12 or del) to go into either a boot selection screen, or sometimes the bios itself, (prior to bios attempting to load boot loader from first listed device).