Hi malyze,

I recommend you do a power drain by following these steps:

1. Turn the system off.
2. Disconnect power chord.
3. Press and hold power button for 30 seconds.
4. Reconnect and turn back on.

Try testing each of the RAM modules and memory slots individually to check if a defective port or memory stick is causing the problem. 

Let me know how it goes!

Hi Naomi,

Thank you for the suggestions. I tried a power drain, and it was still no video / no post.

Next I tried testing each port with each stick of RAM. It seemed to do something odd with the power. The computer started as soon as I plugged in the power cord, then after about 20 seconds, it turned off. And after another 10 seconds, it turned on again by itself. It cycled through this pattern a few times. The only thing that seemed to vary was the fan speed. Sometimes it was pretty quiet, other times it sounded like a landing airplane. When I went back to two sticks of RAM, the computer turned itself on automatically, but it stopped turning itself off.

I'm still very perplexed. Do you think this sounds like more of a power supply issue?

Thank you again for your help!