Ram Problem - Monitor Will Not Turn On

My computer is doing some strange things when i try to install new ram. I currently have 256mb ddr 333 installed but whenever i try to put any other ram in, either separate to the 256, or with it, my monitor will not turn on, and the computer will restart itself intermittently. I have tried 4 separate sticks of ram, 3 512mb ddr 400 and 1 1gb ddr 400. All have the same response. I have two slots on my mob and have tried all combinations with ram and slots. I have updated my bios. I cant edit the bios when the new ram is in because i have no picture. My mob is an asrock p4i45d, with an intel p4 chipset. All the ram i have used have been different brands. Has anyone had this problem before?

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