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.
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.