I can not find where to put the power sw, reset sw and power led on my motherboard?

A motherboard does not have a power switch. The power supply may or may not have one: if it does, you should not use it. (Get a power strip and use the switch on that.)

Some motherboards have a reset switch and some don't.

You will have to search this data to see if there is any hardware reset. I did not find any.
www.google.com/search?site=&tbm=isch&source=hp&biw=1021&bih=739&q=compaq+elite+8300+motherboard+manual