so did lezend ok, reason i said take the heatsink off is because if he has a very large heavy thing like i have, or an intel pentium 4 monster, then i had visions of someone reading this, and holding the motherboard at one end and swinging it about. crunch, one board broke in half.. cracked, damaged tracks, whatever. and TWO: its also easier to get it mounted in the case if the board is light enough to move easily while you line it up, its more awkward getting it lined up on the raisers with a heavy lump of metal wieghing it down. lastly... best tip anyone can give you, lay you machines flat on their side while you work on them!! dont have them stood up in their usual position. touch something like a radiator or tap before working on the case, if Canadians have an earth line on plugs unlike americans, then leave the pc plugged in, and before unplugging everything, touch the unpainted inside of the case somplace, with the pc turned off of course, dont touch anything electrical.. just the case itself, that will discharge and static on you, but only if your mains has an earth line on it. if not.. touch radiator.. Tap.. etc like i said fist.