What kind of mobo is this?

As long as the power is plugged in from the button it is all you need the leds just let's you know they are working.try turning the power leads from the button around switching sides.Know what i mean?

So let's see what we got.

1.Power supply was illiminated.

2.The video card you put in was a known working video card.Nothing.

3.monitor works.

4.Not hdd.

Check the harddrive might have took it out during the short.

Just my 2 cents get both PS\2 Mouse and keyboard.then you won't need to fight to get these to work.if it has 98 then most likely it is usb 1.0 or 1.1 where the mouse and keyboard should be downwards...

If you hear clicking and it is from the HDD then it is all she wrote for the HDD.

make sure the memory is seated good and if that doesn't work take out the new stick you put in.