Last Boy Scout said:
Does not hurt anything to put the cpu and cooler on and then the
RAM and then install the motherboard. It can be hard to see and
maneuver through all those wires and cables and things.
If it were so hard to maneuver through all those wires and cables
and things, placing the mainboard with the CPU/cooler and RAM
already installed would be very difficult or impossible.
I like to test the motherboard to see if it will boot up at least.
Normally if it beeps it will work in the case. Of course you
could hook up a video card just to check it out.
So now you have a video card flopping around in the PCI/AGP slot.
With a video cable hanging off of the card, you might even damage
the slot.
Maybe you have a 10 or 50 to 1 chance you will see a bad
motherboard, but once you get all that junk in the case it is a
pain to take it all out.
Slopping the components into the mainboard outside of the case and
then removing them before inserting the mainboard into the case
would be an unnecessary risk and a waste of time and effort. I am
assuming you remove the components before inserting the mainboard
into the case since you have trouble "maneuvering through all those
wires and cables and things" without any components installed on the
mainboard.
If you want to be safe, you put the mainboard in the case where it's
secure when you install the bare minimum of components.
All those "wires and cables and things" can be easily moved out of
the way. You can drape them over the side of the case. Some of those
cables are required, and with the mainboard is securely fastened
inside of the case, you have a stable set up for connecting those
cables, CPU/fan, RAM, and video card.
If you feel a need to slop the mainboard and components around
outside of the case, just be sure there isn't any metal (like screws
or screwdrivers) under the mainboard.
I have built lots of crude small electronics from scratch. Having a
secure holder (like a case) for the project is a blessing. I see no
good comparison between slopping things around outside of the case
and beginning with the minimum components inside of the case. If you
have so little confidence in your mainboard, you should buy a
different mainboard instead of compounding the perceived damage.
Messing with things outside of the case is just asking for trouble
unless you have a professional set up for holding the mainboard.