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If you do not have pdf viewing capabilities, your browser will prompt you to install the plugin, please allow this install once you've followed the above link. In the pdf document, refer to table 48, on page 71 for how to connect your front panel.
The wire placement is usually written small right on the motherboard. Each front panel connector should be labeled. Here is the owner's manual for the motherboard: http://download.intel.com/support/motherboards/desktop/d815eea/EA_ENGLISH.PDF (Hint: Copy the whole link to notepad, make it all one long sentence, copy again and past into your browser)
If you no longer have the manual for you're Intel D815EEA motherboard, open the link provided and download it; http://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=17793&ProdId=385&lang=eng You will also need Adobe reader installed to view the manual; http://www.adobe.com/products/reader/ Read over pages 65 to 68. Once completed turn to page 68 Figure 23. Front Panel connectors. Figure 23 shows two views. View - (left figure), shows J9C1 as you look down at the front panel pins. The right figure will not be needed. Connect each jumper or each pair as shown. Wire colors are important and do vary from case to case. The common color of each pair will most likely be used for negative. Wire colors such as blue, light blue, green, light green, red and light red are commonly used as positive. Pin 1 will be positive and pin 3 will be negative. This is letter - C. Hard drive activity LED. Pin 2 is positive and pin 4 is negative. Case power LED, and so forth. As mentioned on page 65, the case front panel pins use 5 volts DC. If you make a mistake and place a jumper backwards (No LED light), just power off the switch on the back of the power supply and correct the jumper by turning it 180 deg. If you’re case’s LEDs do not light up than you will need to connect letter G and letter H. The electronic circuits under the motherboard should supply all 16 motherboard pins with the 5 volt DC and ground needed.
So, the M/B has a 3 pin connector, but your case only has a 2 pin connector? Easiest way is just to cut the connector from the case in half with a pair of sissors.. It isn't the most nice solution, but it works quite well!