First, a tangent: I am registered on these boards as "coil", but it appears my account has been disabled and I don't know who to contact and couldn't figure out how to contact them. If someone important sees this, please drop me an email and help me get my actual account sorted! Thanks. _________ OK! Here's the problem. My girlfriend had two sticks of RAM in her machine, a 512 and a 256 of DDR333. She just replaced the 256 with an additional 512 - same speed, etc, it matches. But when she turned it on, she smelled burning and saw smoke out the back of the computer. Obviously, she quickly shut it off. She brought it over to me to take a look. Here's what I've deduced: 1) The computer will not boot, even with the new RAM removed. Power goes on, the fans spin up, but there's no booting, no hard drive beep, no display, nothing. 2) As far as I can tell, she somehow managed to put the new stick of RAM in *backwards*, even though the slot on the chip is asymmetrical. I can tell this because 3) There are three small burn marks on the new stick of RAM, specifically on three of the metal "teeth" (I don't know what else to call them) plating the part of the chip that actually connects to the motherboard. There are three matching melt marks on the plastic RAM slot on the motherboard (and as I said, these corroborate that she put the chip in backwards). ______ So... it seems that something between the mobo and new RAM melted. The questions I want to get answered are: 1) Why? Was it bad RAM? Was it because she put it in backwards? 2) What's still busted? My guess is the mobo - am I right? Assuming I am, is that all that needs to be replaced? Thanks all!