Question about PSU to Mobo connection

Hey all:

I just built my first system last night, went together really well, however two issues. Turn power on no video/no keyboard(usb). All case fans and CPU fan seem to be running and I see lights on the Mobo. Could this possibly be an issue with my PSU-Mobo (8-pin connection)? The 24 pin is no problem but the PSU gace me three leads for Mobo 4-pin, 6-pin and 8-pin. The 8-pin slot on the Mobo had 4-pins covered with a small plastic cap, so I only used the 4-pin. What say you?

Thanks alot.

Intel Core i5-750
ASUS P7P55D-E PRO
G.SKILL Ripjaws 4GB
DDR3 1600
SAPPHIRE Radeon HD 5770 1GB 128-bit GDDR5
Antec Three Hundred Illusion
Antec EarthWatts EA650 650W
Seagate Barracuda 160GB
Sony Optiarc 24X DVD/CD
Acer P235Hbmid 23\" Widescreen LCD
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More about question mobo connection
  1. 1) Remove the plastic cover and plug in the 8-pin ATX connector. Try booting again

    2) If it still won't boot, read through this sticky and complete all the items on the checklist... http://www.tomshardware.com/forum/261145-31-read-posting-boot-problems
  2. Did you connect the 6 Pin PCI-e connector to your 5770 - Required. If not this may be reason for no video

    Should not need the 8 Pin ATX, the 4 Pin is fine for a I5-750. So that is not the problem.

    (1) The 8-pin connection is required for Processors => than 125 W. The I5-750 is a Max 95 W Proc.

    (2) Although not required, I use the 8-pin if available.

    (6) the 6-pin connector is for PCI-e on GPU. MB uses only 20/24 Pin and a 4/8 Pin connection for Power.

    *** PCIE connectors can be 4 - 6 - 8 Pin. Caution - DO NOT put a 8 Pin PCI-e into a MB 8 Pin.
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