Computer starts then two seconds later shuts down

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I turned on my computer this and it shut down after about 2 seconds.

I have tried other ram and things, no difference, the hard drive is starting because it vibrates when you lift it, all the fans are starting up fine.

I tried taking out all the wires and re-seating them, and I have noticed something - you know the yellow and black came with the 4 pins that goes into the motherdrive, when I take that out the machine stays on but theres no graphics on screen, but when I plug it back in - it just shuts down again.

Anyone know what is going on? or how to fix this?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References www.techspot.com/community/topics/computer-starts-then-two-seconds-later-shuts-down.138884/

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