I can not see a good photo of this board, from what I can see it has no CPU power connection correct?
(If you upgraded your RAM)Do you have the correct type and amount of RAM required? DDR200 or DDR433 and above wont work with this Motherboard. Only DDR400, DDR333, and DDR266 SDRAM will.
You could try the slotted edge screwdriver trick on the Power Switch connection. Or find a second switch to test that the switch does work.
Pointless question. If it doesn have one, whats he suppost to do? Use a soldering iron and put one on it.
Pointless question. DDR2 will not fit in DDR slots.
The only one out of three worth asking.