Screwed up installing ram

I got a 512 stick of ram for christmas and was told i could have my 2x 256 chips in 2 of the bays and 1 512 in the other as long as they matched total amounts well i know this is horridly wrong now and for some reason my monitor has no video and my usb and probably fire wire ports arnt providing power. Please help me

The ram is installed exactly how it should be and I dont have video or usb port power I do have fire wire power though after the computer sits for a few min it the fans get extreamly loud much louder then I have heard them before and on start up it seems to start up and gets loud how it should then the noise dies quickly. Please if anyone has an idea let me know I really need to get this fixed

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