How to connect graphics card to psu

[Guest]

Hallo
I build a new pc(my first time). I have a nvidia geforce 9800 gt graphics card and a ezcool 950 w psu. My problem is that the power cable for the graphics have got 3 pins and the ones on my psu all have 4. Where do I plug my graphics card in?
I also have another problem, all the fans are running but my keyboard, mouse and monitor is not working. Is there no power to the motherboard and what can be the cause of that?

Regards

Sonja
South Africa

 

[knotknut]

Your 9800 GT should have 6pin connector like the one in this picture. (5th Picture)
http://www.newegg.com/Product/ShowImage.aspx?ISList=14-125-246-S01%2c14-125-246-S02%2c14-125-246-S03%2c14-125-246-S04%2c14-125-246-S05%2c14-125-246-S06&S7ImageFlag=1&Item=N82E16814125246&Depa=0&WaterMark=1&Description=GIGABYTE%20GV-N98TOC-1GH%20GeForce%209800%20GT%201GB%20256-bit%20GDDR3%20PCI%20Express%202.0%20x16%20HDCP%20Ready%20SLI%20Supported%20Video%20Card%20-%20Retail
If your Powersupply does not have that connector you might have to buy one of these:
http://www.newegg.com/Product/Product.aspx?Item=N82E16812189120

"I also have another problem, all the fans are running but my keyboard, mouse and monitor is not working. Is there no power to the motherboard and what can be the cause of that?"
Connect the 4 or 8 pin connector located close to CPU to the powersupply.
It will be square with 4pins or rectangle with two rows of 4pins