For the very first day.....

Today,
I worked.

Well, well.
My computer gave me problem again.
I still can't figure out what is the problem.
No display, black screen, no response.

Suspect 1,
graphic card, maybe some defect.
But I just changed my graphic card,
so, probably not.

Suspect 2,
motherboard.
This is 6 years old motherboard,
but I still not sure about this.
If this is motherboard problem,
then I have to change the whole system.
This is a 478 socket, DDR RAM slot, AGP 8x slot,
I don't want to change the motherboard.
I rather choose to change a new system.

Suspect 3,
............
no more.
I can't think of any problem.

I should do more try and error.

Help me to fix it.