Posted 15 March 2011 - 10:19 PM
A two year old mobo should be able to support 2 gigs of ram -- although, on the odd chance it doesn't, that could be the source of your problem. We really need the specs of the computer, as well as the ram you're trying to install, to make sure everything 'should' work. Without knowing the specs, I'd have to agree with Eyesee -- try testing one stick at a time. Also check the contacts on the ram and make sure there isn't any sign of damage or dirt that could be causing a bad connection.
Make sure the ram is connected correctly, as well. There is a small gap in the center of the ram, and that gap should line up where it plugs into the motherboard. When the ram is correctly positioned, push it in from both sides. If you are plugging it in correctly, you'll feel and see the plastic clips -- which you unclipped to remove the old ram -- clip into place as the new ram correctly slides into place. Push them into place cautiously, but sometimes they do require a decent amount of force. [If something seems wrong -- like something is bending too much when you try to install the ram -- always stop! Better to be safe than sorry. Trust your gut.]
Another option is what "channels" you have the ram in. Some motherboards might have 4 ram slots. If you're only using two of those slots, you need to make sure you place both sticks of ram in the same color channel. There should be two channels, if your motherboard supports dual channels -- each channel has a certain color. If you're installing two sticks of ram, make sure those sticks are in the same color slots on the motherboard. If you have them in the same color, and the problem is still happening, move them both to the other color available -- I've seen cases where, when you're only using only one color channel, the ram has to be in a specific channel and won't post the computer till you move it to the other color.
Just my two cents for now. Post the specs and I'm sure we'll be able to give you a little more help.