simple let your fingers do the thinking, by follow your white and a blue cable twisted together to other end of it and then orange, green and black wire twisted together, to thier ends an see where they go on front cover
note most cases are
start: blu/wht
power led: grn/wht
speaker:red/blk
HDD led: org/wht
for the led's connections they have to be polarity correct to work, flip them around if not lighting up
the wht usally is the positive on led wiring
start sw or reset sw not a issue
speaker some need to be correct
as rest said
check your MB manual .pdf pinout for front header
Note: for the message/ power , usally is a double filament daul color led
if don't have one, can use pin #2, #4, #6 pin#4 is common = negitive #2=msg #6= power