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Gigabyte GA-EP43T-USB3 power-on issue

Motherboards Gigabyte Forum - www.tomshardware.com
About a week ago, my custom desktop comptuer started to experience "bearing" from the power supply fan area. I also was looking into install one of my old graphics card - an amd radeon 6670 - but realized that my Power supply was also lacking the amount of wattage to even consider the graphics card to be installed in my system.

I purchased a 550-Watt power supply, went to install it into the system while removing the old, 300-Watt power supply.

When I connected everything back up, the system would no longer boot. I tried swapping back the power supplies again to see if it was the 550-Watt PSU that came to me DoA. It didn't power on with the older 300-Watt PSU either, and nothing else was moved but the power supplies themselves.

I made sure all connections were connected correcting (cpu fan and 4 pin power connector, ATXV12 connector) and still no avail.

It powers on with all fans except the CPU fan spinning, then 3 seconds later it shuts off. It does this twice before it stays off completely.

Is there something that I am doing wrong or ignoring?

I have:

- MB: Gigabyte GA-EP43T-USB3

- Intel Core 2 duo processor

- 500-Watt power supply

- 2x 2GB ram sticks


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