i added 1gb pc 3200 cl2, 184-pin ram to the MSI 661FM2-LSR Motherboard, and all it did was beep at me. so i turned the pc off and put the other stick back in it. Now the computer will just start up, the monitor willn't turn on.
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Sounds like you accidentally disconnected something, or forgot to reconnect something. Unplug and replug *all* the power connectors, and use some canned air to blow all the dust off the MB and out of the case.